2721462

Appears in sequences

• Triangle, read by rows, where the g.f. of column k, C_k(x), is defined by the recurrence: C_k(x) = [ 1 + Sum_{n>=k+1} C_n(x)*x^(n-k) ]^(k+1) for k>=0.at n=47A127126
• Column 2 of triangle A127126.at n=7A127129