a(n) = (10*n + 8)^6.

Terms

a(0) =262144a(1) =34012224a(2) =481890304a(3) =3010936384a(4) =12230590464a(5) =38068692544a(6) =98867482624a(7) =225199600704a(8) =464404086784a(9) =885842380864