a(n) = (11*n + 1)^4.

Terms

a(0) =1a(1) =20736a(2) =279841a(3) =1336336a(4) =4100625a(5) =9834496a(6) =20151121a(7) =37015056a(8) =62742241a(9) =100000000a(10) =151807041a(11) =221533456a(12) =312900721a(13) =429981696a(14) =577200625a(15) =759333136a(16) =981506241a(17) =1249198336a(18) =1568239201a(19) =1944810000a(20) =2385443281a(21) =2897022976a(22) =3486784401a(23) =4162314256a(24) =4931550625a(25) =5802782976