a(n) = 3*n*(310*n^2 + 63*n - 12).

Terms

a(0) =1083a(1) =8124a(2) =26703a(3) =62400a(4) =120795a(5) =207468a(6) =327999a(7) =487968a(8) =692955a(9) =948540a(10) =1260303a(11) =1633824a(12) =2074683a(13) =2588460a(14) =3180735a(15) =3857088a(16) =4623099a(17) =5484348a(18) =6446415a(19) =7514880a(20) =8695323a(21) =9993324a(22) =11414463a(23) =12964320a(24) =14648475a(25) =16472508