a(n) = 3600*n^2 - n.

Terms

a(0) =3599a(1) =14398a(2) =32397a(3) =57596a(4) =89995a(5) =129594a(6) =176393a(7) =230392a(8) =291591a(9) =359990a(10) =435589a(11) =518388a(12) =608387a(13) =705586a(14) =809985a(15) =921584a(16) =1040383a(17) =1166382a(18) =1299581a(19) =1439980a(20) =1587579a(21) =1742378a(22) =1904377a(23) =2073576a(24) =2249975a(25) =2433574a(26) =2624373a(27) =2822372