a(n) = (9*n + 4)^5.

Terms

a(0) =1024a(1) =371293a(2) =5153632a(3) =28629151a(4) =102400000a(5) =282475249a(6) =656356768a(7) =1350125107a(8) =2535525376a(9) =4437053125a(10) =7339040224a(11) =11592740743a(12) =17623416832a(13) =25937424601a(14) =37129300000a(15) =51888844699a(16) =71008211968