a(n) = 384*n^3 - 1184*n^2 + 1228*n - 427.

Terms

a(0) =-427a(1) =1a(2) =365a(3) =2969a(4) =10117a(5) =24113a(6) =47261a(7) =81865a(8) =130229a(9) =194657a(10) =277453a(11) =380921a(12) =507365a(13) =659089a(14) =838397a(15) =1047593a(16) =1288981a(17) =1564865a(18) =1877549a(19) =2229337a(20) =2622533a(21) =3059441a(22) =3542365a(23) =4073609a(24) =4655477a(25) =5290273a(26) =5980301a(27) =6727865a(28) =7535269a(29) =8404817