a(n) = 64*n^3 - 168*n^2 + 148*n - 43.

Terms

a(0) =1a(1) =93a(2) =617a(3) =1957a(4) =4497a(5) =8621a(6) =14713a(7) =23157a(8) =34337a(9) =48637a(10) =66441a(11) =88133a(12) =114097a(13) =144717a(14) =180377a(15) =221461a(16) =268353a(17) =321437a(18) =381097a(19) =447717a(20) =521681a(21) =603373a(22) =693177a(23) =791477a(24) =898657a(25) =1015101a(26) =1141193a(27) =1277317a(28) =1423857a(29) =1581197