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

Terms

a(0) =3125a(1) =537824a(2) =6436343a(3) =33554432a(4) =115856201a(5) =312500000a(6) =714924299a(7) =1453933568a(8) =2706784157a(9) =4704270176a(10) =7737809375a(11) =12166529024a(12) =18424351793a(13) =27027081632a(14) =38579489651a(15) =53782400000a(16) =73439775749a(17) =98465804768a(18) =129891985607a(19) =168874213376a(20) =216699865625a(21) =274794888224a(22) =344730881243