a(n) = 3*(n - 1)^2*n^3.

Terms

a(0) =0a(1) =0a(2) =24a(3) =324a(4) =1728a(5) =6000a(6) =16200a(7) =37044a(8) =75264a(9) =139968a(10) =243000a(11) =399300a(12) =627264a(13) =949104a(14) =1391208a(15) =1984500a(16) =2764800a(17) =3773184a(18) =5056344a(19) =6666948a(20) =8664000a(21) =11113200a(22) =14087304a(23) =17666484a(24) =21938688a(25) =27000000a(26) =32955000a(27) =39917124a(28) =48009024a(29) =57362928