a(n) = 432*n^6.

Terms

a(0) =0a(1) =432a(2) =27648a(3) =314928a(4) =1769472a(5) =6750000a(6) =20155392a(7) =50824368a(8) =113246208a(9) =229582512a(10) =432000000a(11) =765314352a(12) =1289945088a(13) =2085181488a(14) =3252759552a(15) =4920750000a(16) =7247757312a(17) =10427429808a(18) =14693280768a(19) =20323820592a(20) =27648000000a(21) =37050964272a(22) =48980118528