About Equation HACS.2.2.2.4
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\begin{equation*} 
\begin{split} 
u (n)& =\frac{2^{\bigl(n + \frac{1}{2}\bigr)} \Gamma \Bigl(n + \frac{1}{2}\Bigr) (-1)^{n}}{4^{n} \sqrt{\pi} \Gamma (n + 1) (2 n + 1)} 
\end{split} 
\end{equation*}
Absolute reference: HACS:asympt:1:RDINREFRDGENFROMRDCLOSED
LaTeX encoding
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u (n) = \frac{2^{\bigl(n + \frac{1}{2}\bigr)} \Gamma \Bigl(n + \frac{1}{2}\Bigr) (-1)^{n}}{4^{n} \sqrt{\pi} \Gamma (n + 1) (2 n + 1)}
Maple encoding
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u(n) = 2^(n+1/2)*4^(-n)/Pi^(1/2)/GAMMA(n+1)/(2*n+1)*GAMMA(n+1/2)*(-1)^n
MathML encoding
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