a(n) = n*(3*n+14).

Terms

a(0) =0a(1) =17a(2) =40a(3) =69a(4) =104a(5) =145a(6) =192a(7) =245a(8) =304a(9) =369a(10) =440a(11) =517a(12) =600a(13) =689a(14) =784a(15) =885a(16) =992a(17) =1105a(18) =1224a(19) =1349a(20) =1480a(21) =1617a(22) =1760a(23) =1909a(24) =2064a(25) =2225a(26) =2392a(27) =2565a(28) =2744a(29) =2929