12222222222
domain: N
Appears in sequences
- Number of nodes on a tree with degree 11 interior nodes and degree 1 boundary nodes.at n=10A090843
- Expansion of g.f. x*(1+11*x+x^2)/((1-x)*(1+x)*(1-10*x^2)).at n=21A094624
- Expansion of x*(1+x)/((1-x)*(1-10*x^2)).at n=21A094626
- 1 followed by 2n 2's.at n=5A131970
- First elements of the pairs listed in A134514.at n=19A134584