 | ECS #427 |
| Introduction | Examples | Search | Submit | Help | Links |
1. Description
No description available
2. Specification
This unlabelled structure is specified as S in
\displaystyle
\left\{ S={\rm Sequence} \left( {\rm Union} \left( {\rm Prod} \left( Z
,Z \right) ,Z,Z,Z,Z,Z,Z \right) \right) \right\}
other formats
3. Coefficients
3.1. First terms
3.2. Recurrence
\displaystyle
\left\{ f \left( n \right) +6\,f \left( n+1 \right) -f \left( n+2
\right) =0,f \left( 0 \right) =1,f \left( 1 \right) =6 \right\}
other formats
3.3. Closed form
\displaystyle
\sum _{\alpha={\rm RootOf} \left( -1+{{\rm \_Z}}^{2}+6\,{\rm \_Z}
\right) }1/20\, \left( \alpha+3 \right) {\alpha}^{-1-n}
other formats
3.4. Asymptotics
4. Ordinary generating function
\displaystyle
- \left( -1+{x}^{2}+6\,x \right) ^{-1}
other formats
5. References
6. Random structure
Search a combinatorial structure by: (firstTerms should be a sequence of integers, separated by commas).