48932534040
domain: N
Appears in sequences
- a(n) = (1/(4n-1))*C(4n,2n).at n=11A024491
- 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=21A068875
- Denominators of values T(m,m) of urn game described in A108885 and A108886.at n=21A108884
- 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=20A228403
- Number of rooted asymmetrical polyenoids of type U_n* having n edges.at n=21A262543
- a(-1)=-1; a(n) = 2*A000108(n) for n >= 0.at n=22A284016