2*n^3 - 313*n^2 + 6823*n - 13633.

Terms

a(0) =-13633a(1) =-7121a(2) =-1223a(3) =4073a(4) =8779a(5) =12907a(6) =16469a(7) =19477a(8) =21943a(9) =23879a(10) =25297a(11) =26209a(12) =26627a(13) =26563a(14) =26029a(15) =25037a(16) =23599a(17) =21727a(18) =19433a(19) =16729a(20) =13627a(21) =10139a(22) =6277a(23) =2053a(24) =-2521a(25) =-7433a(26) =-12671a(27) =-18223a(28) =-24077a(29) =-30221