a(n) = (4*n+1)*(4*n+2)*(4*n+3).

Terms

a(0) =6a(1) =210a(2) =990a(3) =2730a(4) =5814a(5) =10626a(6) =17550a(7) =26970a(8) =39270a(9) =54834a(10) =74046a(11) =97290a(12) =124950a(13) =157410a(14) =195054a(15) =238266a(16) =287430a(17) =342930a(18) =405150a(19) =474474a(20) =551286a(21) =635970a(22) =728910a(23) =830490a(24) =941094a(25) =1061106a(26) =1190910a(27) =1330890a(28) =1481430a(29) =1642914