68336

Appears in sequences

• Number of unlabeled identity interval graphs with n nodes.at n=10A005216
• Number of mobiles (cycle rooted trees) with n generators.at n=9A108526
• G.f.: M(F(x)) is a power series in x consisting entirely of positive integer coefficients such that M(F(x) - x^k) has negative coefficients for k>0, where M(x) = 1 + x*M(x) + x*M(x)^2 is the g.f. of the Motzkin numbers A001006.at n=32A251571