<math xmlns='http://www.w3.org/1998/Math/MathML'><semantics><mrow xref='id19'><mrow xref='id7'><mi xref='id1'>u</mi><mo>⁡</mo><mfenced><mrow xref='id6'><mrow xref='id4'><mn xref='id2'>2</mn><mo>⁢</mo><mi xref='id3'>n</mi></mrow><mo>+</mo><mn xref='id5'>1</mn></mrow></mfenced></mrow><mo>=</mo><mrow xref='id18'><mfrac><mrow xref='id10'><msup><mfenced><mn xref='id8'>-1</mn></mfenced><mi xref='id9'>n</mi></msup></mrow><mrow xref='id17'><mi>Γ</mi><mo>⁡</mo><mfenced><mrow xref='id16'><mrow xref='id14'><mn xref='id12'>2</mn><mo>⁢</mo><mi xref='id13'>n</mi></mrow><mo>+</mo><mn xref='id15'>2</mn></mrow></mfenced></mrow></mfrac></mrow></mrow><annotation-xml encoding='MathML-Content'><apply id='id19'><eq/><apply id='id7'><ci id='id1'>u</ci><apply id='id6'><plus/><apply id='id4'><times/><cn id='id2' type='integer'>2</cn><ci id='id3'>n</ci></apply><cn id='id5' type='integer'>1</cn></apply></apply><apply id='id18'><divide/><apply id='id10'><power/><cn id='id8' type='integer'>-1</cn><ci id='id9'>n</ci></apply><apply id='id17'><csymbol id='id11' definitionURL='http://www.maplesoft.com/MathML/GAMMA'>GAMMA</csymbol><apply id='id16'><plus/><apply id='id14'><times/><cn id='id12' type='integer'>2</cn><ci id='id13'>n</ci></apply><cn id='id15' type='integer'>2</cn></apply></apply></apply></apply></annotation-xml><annotation encoding='Maple'>u(2*n+1) = 1/GAMMA(2*n+2)*(-1)^n</annotation></semantics></math>
<math xmlns='http://www.w3.org/1998/Math/MathML'><semantics><mrow xref='id7'><mrow xref='id5'><mi xref='id1'>u</mi><mo>⁡</mo><mfenced><mrow xref='id4'><mn xref='id2'>2</mn><mo>⁢</mo><mi xref='id3'>n</mi></mrow></mfenced></mrow><mo>=</mo><mn xref='id6'>0</mn></mrow><annotation-xml encoding='MathML-Content'><apply id='id7'><eq/><apply id='id5'><ci id='id1'>u</ci><apply id='id4'><times/><cn id='id2' type='integer'>2</cn><ci id='id3'>n</ci></apply></apply><cn id='id6' type='integer'>0</cn></apply></annotation-xml><annotation encoding='Maple'>u(2*n) = 0</annotation></semantics></math>
