a(n) = n*(4*n - 3)*(16*n^2 - 12*n - 3).

Terms

a(0) =0a(1) =1a(2) =370a(3) =2835a(4) =10660a(5) =28645a(6) =63126a(7) =121975a(8) =214600a(9) =351945a(10) =546490a(11) =812251a(12) =1164780a(13) =1621165a(14) =2200030a(15) =2921535a(16) =3807376a(17) =4880785a(18) =6166530a(19) =7690915a(20) =9481780a(21) =11568501a(22) =13981990a(23) =16754695a(24) =19920600a(25) =23515225a(26) =27575626a(27) =32140395a(28) =37249660a(29) =42945085