a(n) = Sum_{d|n} (-1)^(d-1)*d^5.

Terms

a(0) =1a(1) =-31a(2) =244a(3) =-1055a(4) =3126a(5) =-7564a(6) =16808a(7) =-33823a(8) =59293a(9) =-96906a(10) =161052a(11) =-257420a(12) =371294a(13) =-521048a(14) =762744a(15) =-1082399a(16) =1419858a(17) =-1838083a(18) =2476100a(19) =-3297930a(20) =4101152a(21) =-4992612a(22) =6436344a(23) =-8252812a(24) =9768751a(25) =-11510114a(26) =14408200a(27) =-17732440a(28) =20511150a(29) =-23645064