a(n) = Sum_{i=n+1..2n} i^n.A074209a(n) = Sum_{i=n+1..2n} i^n.Terms a(0) =2a(1) =25a(2) =405a(3) =8418a(4) =216400a(5) =6668779a(6) =240361121a(7) =9936764996a(8) =463893277176External referencesoeis: A074209