a(n) = (k-n+1)^n + (k-n+2)^n + ... + (k-1)^n + k^n, where k = n(n+1)/2.
A069876
a(n) = (k-n+1)^n + (k-n+2)^n + ... + (k-1)^n + k^n, where k = n(n+1)/2.
Terms
- a(0) =1a(1) =13a(2) =405a(3) =23058a(4) =2078375a(5) =271739011a(6) =48574262275
External references
- oeis: A069876