a(n) = Sum_{k = 0..n} (k*(k+1)/2)^n.

A249564

a(n) = Sum_{k = 0..n} (k*(k+1)/2)^n.

Terms

    a(0) =1a(1) =1a(2) =10a(3) =244a(4) =11378a(5) =867395a(6) =98204132a(7) =15475158552

External references