a(n) = floor((n + 1/2)^7).

Terms

a(0) =0a(1) =17a(2) =610a(3) =6433a(4) =37366a(5) =152243a(6) =490222a(7) =1334838a(8) =3205770a(9) =6983372a(10) =14071004a(11) =26600198a(12) =47683715a(13) =81721509a(14) =134764658a(15) =214942297a(16) =332956585a(17) =502650756a(18) =741655290a(19) =1072117239a(20) =1521517764a(21) =2123582899a(22) =2919292602a(23) =3957993128