Let S(m, n):=Sum_{k=1..n} k^m; we define a(1):=S(1, 1), a(2):=S(2, S(1, 2)) etc., a(n):=S(n, S(n-1, S(n-2, ...S(1, n)...))).

A113776

Let S(m, n):=Sum_{k=1..n} k^m; we define a(1):=S(1, 1), a(2):=S(2, S(1, 2)) etc., a(n):=S(n, S(n-1, S(n-2, ...S(1, n)...))).