a(n) = 2*n*(4*n + 3).

Terms

a(0) =0a(1) =14a(2) =44a(3) =90a(4) =152a(5) =230a(6) =324a(7) =434a(8) =560a(9) =702a(10) =860a(11) =1034a(12) =1224a(13) =1430a(14) =1652a(15) =1890a(16) =2144a(17) =2414a(18) =2700a(19) =3002a(20) =3320a(21) =3654a(22) =4004a(23) =4370a(24) =4752a(25) =5150a(26) =5564a(27) =5994a(28) =6440a(29) =6902