a(n) = n*(3*n - 2)*(9*n^2 - 6*n - 2).

Terms

a(0) =0a(1) =1a(2) =176a(3) =1281a(4) =4720a(5) =12545a(6) =27456a(7) =52801a(8) =92576a(9) =151425a(10) =234640a(11) =348161a(12) =498576a(13) =693121a(14) =939680a(15) =1246785a(16) =1623616a(17) =2080001a(18) =2626416a(19) =3273985a(20) =4034480a(21) =4920321a(22) =5944576a(23) =7120961a(24) =8463840a(25) =9988225a(26) =11709776a(27) =13644801a(28) =15810256a(29) =18223745