a(n) = (6*n + 5)^5.

Terms

a(0) =3125a(1) =161051a(2) =1419857a(3) =6436343a(4) =20511149a(5) =52521875a(6) =115856201a(7) =229345007a(8) =418195493a(9) =714924299a(10) =1160290625a(11) =1804229351a(12) =2706784157a(13) =3939040643a(14) =5584059449a(15) =7737809375a(16) =10510100501a(17) =14025517307a(18) =18424351793a(19) =23863536599a(20) =30517578125a(21) =38579489651a(22) =48261724457