a(n) = (10*n + 3)^4.

Terms

a(0) =81a(1) =28561a(2) =279841a(3) =1185921a(4) =3418801a(5) =7890481a(6) =15752961a(7) =28398241a(8) =47458321a(9) =74805201a(10) =112550881a(11) =163047361a(12) =228886641a(13) =312900721a(14) =418161601a(15) =547981281a(16) =705911761a(17) =895745041a(18) =1121513121a(19) =1387488001a(20) =1698181681a(21) =2058346161a(22) =2472973441a(23) =2947295521a(24) =3486784401a(25) =4097152081