a(n) = (5n+3)^5.

Terms

a(0) =243a(1) =32768a(2) =371293a(3) =1889568a(4) =6436343a(5) =17210368a(6) =39135393a(7) =79235168a(8) =147008443a(9) =254803968a(10) =418195493a(11) =656356768a(12) =992436543a(13) =1453933568a(14) =2073071593a(15) =2887174368a(16) =3939040643a(17) =5277319168a(18) =6956883693