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

Terms

a(0) =0a(1) =5a(2) =14a(3) =27a(4) =44a(5) =65a(6) =90a(7) =119a(8) =152a(9) =189a(10) =230a(11) =275a(12) =324a(13) =377a(14) =434a(15) =495a(16) =560a(17) =629a(18) =702a(19) =779a(20) =860a(21) =945a(22) =1034a(23) =1127a(24) =1224a(25) =1325a(26) =1430a(27) =1539a(28) =1652a(29) =1769