a(n) = n^9 - n^8.

Terms

a(0) =0a(1) =0a(2) =256a(3) =13122a(4) =196608a(5) =1562500a(6) =8398080a(7) =34588806a(8) =117440512a(9) =344373768a(10) =900000000a(11) =2143588810a(12) =4729798656a(13) =9788768652a(14) =19185257728a(15) =35880468750a(16) =64424509440a(17) =111612119056a(18) =187339329792a(19) =305704134738a(20) =486400000000a(21) =756457187220