a(n) = (10*n + 8)^5.

Terms

a(0) =32768a(1) =1889568a(2) =17210368a(3) =79235168a(4) =254803968a(5) =656356768a(6) =1453933568a(7) =2887174368a(8) =5277319168a(9) =9039207968a(10) =14693280768a(11) =22877577568a(12) =34359738368a(13) =50049003168a(14) =71008211968a(15) =98465804768a(16) =133827821568