a(n) = n^5 - n^3 - n^2.

Terms

a(0) =0a(1) =-1a(2) =20a(3) =207a(4) =944a(5) =2975a(6) =7524a(7) =16415a(8) =32192a(9) =58239a(10) =98900a(11) =159599a(12) =246960a(13) =368927a(14) =534884a(15) =755775a(16) =1044224a(17) =1414655a(18) =1883412a(19) =2468879a(20) =3191600a(21) =4074399a(22) =5142500a(23) =6423647a(24) =7948224a(25) =9749375a(26) =11863124a(27) =14328495a(28) =17187632a(29) =20485919