Number of points in Z^9 of norm <= n.

Terms

a(0) =1a(1) =19a(2) =2869a(3) =84663a(4) =995241a(5) =7129227a(6) =35372141a(7) =140246303a(8) =458690081a(9) =1318315075a(10) =3375505573a(11) =7945596055a(12) =17282877369a(13) =35516896155a(14) =68960061837a(15) =128236319951a(16) =228701936081a(17) =394678200083a(18) =658850300869