 | ECS #383 |
| 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 Union} \left( {\rm Prod} \left( Z,{\rm Sequence}
\left( {\rm Prod} \left( Z,Z \right) \right) \right) ,{\rm Sequence}
\left( Z \right) \right) \right\}
other formats
3. Coefficients
3.1. First terms
3.2. Recurrence
\displaystyle
\left\{ -f \left( n \right) -f \left( n+1 \right) +3=0,f \left( 0
\right) =1,f \left( 1 \right) =2 \right\}
other formats
3.3. Closed form
\displaystyle
3/2+1/2\, \left( -1 \right) ^{1-n}
other formats
3.4. Asymptotics
4. Ordinary generating function
\displaystyle
-{\frac {2\,x+1}{ \left( -1+x \right) \left( x+1 \right) }}
other formats
5. References
6. Random structure
Search a combinatorial structure by: (firstTerms should be a sequence of integers, separated by commas).