a(n) = 1^n + 2^n + ... + 5^n.

Terms

a(0) =5a(1) =15a(2) =55a(3) =225a(4) =979a(5) =4425a(6) =20515a(7) =96825a(8) =462979a(9) =2235465a(10) =10874275a(11) =53201625a(12) =261453379a(13) =1289414505a(14) =6376750435a(15) =31605701625a(16) =156925970179a(17) =780248593545