230505

Appears in sequences

• a(n) = (n+1)(n+2)^2*(n+3)^2*(n+4)(5n^2 + 21n + 20)/2880.at n=8A107956
• a(n) = Sum_{i=0..n} digsum(i)^4, where digsum(i) = A007953(i).at n=49A231689
• Birooted graphs: number of unlabeled connected graphs with n nodes rooted at 2 indistinguishable roots.at n=7A303831
• Triangle T(n,k) read by rows: number of bicolored connected graphs with n nodes and k nodes of the first color.at n=38A304311
• Triangle T(n,k) read by rows: number of bicolored connected graphs with n nodes and k nodes of the first color.at n=42A304311