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

Terms

a(0) =0a(1) =24a(2) =84a(3) =198a(4) =384a(5) =660a(6) =1044a(7) =1554a(8) =2208a(9) =3024a(10) =4020a(11) =5214a(12) =6624a(13) =8268a(14) =10164a(15) =12330a(16) =14784a(17) =17544a(18) =20628a(19) =24054a(20) =27840a(21) =32004a(22) =36564a(23) =41538a(24) =46944a(25) =52800a(26) =59124a(27) =65934a(28) =73248a(29) =81084