182965127280
domain: N
Appears in sequences
- Dirichlet convolution of Catalan numbers with themselves.at n=22A034768
- Composite binary rooted trees with external nodes.at n=44A035102
- Expansion of (1 + x*C)*C, where C = (1 - (1 - 4*x)^(1/2))/(2*x) is the g.f. for Catalan numbers, A000108.at n=22A068875
- Expansion of exp( arcsinh( -2*x ) ) in powers of x.at n=46A104624
- Expansion of exp( arcsinh( 2*x ) ).at n=46A182122
- The number of boundary twigs for complete binary twigs. A twig is a vertex with one edge on the boundary and only one other descendant.at n=21A228403
- Certain directed lattice paths.at n=11A260775
- Number of rooted asymmetrical polyenoids of type U_n* having n edges.at n=22A262543
- a(-1)=-1; a(n) = 2*A000108(n) for n >= 0.at n=23A284016