30990

Appears in sequences

• Number of rooted unlabeled trees on n nodes having a primary branch.at n=13A027415
• a(n) = (n^4 + 16*n^3 + 65*n^2 + 26*n + 12)/12.at n=21A188480
• G.f.: Im((2*i; x)_oo), where (a; q)_oo is the q-Pochhammer symbol, i = sqrt(-1).at n=43A292140