a(n) = 1944*n^2 - 5016*n + 3138 (n >= 1).

Terms

a(0) =66a(1) =882a(2) =5586a(3) =14178a(4) =26658a(5) =43026a(6) =63282a(7) =87426a(8) =115458a(9) =147378a(10) =183186a(11) =222882a(12) =266466a(13) =313938a(14) =365298a(15) =420546a(16) =479682a(17) =542706a(18) =609618a(19) =680418a(20) =755106a(21) =833682a(22) =916146a(23) =1002498a(24) =1092738a(25) =1186866a(26) =1284882a(27) =1386786a(28) =1492578a(29) =1602258