a(n) = n^5 - n^4 + n^3 - n^2 + n.

Terms

a(0) =0a(1) =1a(2) =22a(3) =183a(4) =820a(5) =2605a(6) =6666a(7) =14707a(8) =29128a(9) =53145a(10) =90910a(11) =147631a(12) =229692a(13) =344773a(14) =501970a(15) =711915a(16) =986896a(17) =1340977a(18) =1790118a(19) =2352295a(20) =3047620a(21) =3898461a(22) =4929562a(23) =6168163a(24) =7644120a(25) =9390025a(26) =11441326a(27) =13836447a(28) =16616908a(29) =19827445