 | ECS #306 |
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1. Description
No description available
2. Specification
This unlabelled structure is specified as S in
\displaystyle
\left\{ S={\rm Prod} \left( {\rm Union} \left( {\rm Epsilon},Z
\right) ,{\rm Sequence} \left( {\rm Union} \left( Z,Z,Z,Z \right)
\right) \right) \right\}
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3. Coefficients
3.1. First terms
3.2. Recurrence
\displaystyle
\left\{ 4\,f \left( n \right) -f \left( n+1 \right) =0,f \left( 0
\right) =1,f \left( 1 \right) =5 \right\}
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3.3. Closed form
\displaystyle
5\,{2}^{2\,n-2}+\cases{-1/4&$n=0$\cr 0&otherwise\cr}
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3.4. Asymptotics
4. Ordinary generating function
\displaystyle
-{\frac {1+x}{-1+4\,x}}
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5. References
6. Random structure
Search a combinatorial structure by: (firstTerms should be a sequence of integers, separated by commas).