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

Terms

a(0) =2a(1) =250a(2) =2662a(3) =13718a(4) =48778a(5) =137842a(6) =332750a(7) =715822a(8) =1409938a(9) =2590058a(10) =4496182a(11) =7447750a(12) =11859482a(13) =18258658a(14) =27303838a(15) =39805022a(16) =56745250a(17) =79303642a(18) =108879878a(19) =147120118a(20) =195944362a(21) =257575250a(22) =334568302a(23) =429843598a(24) =546718898