Number of integer solutions to (x_1)^2 + (x_2)^2 + ... + (x_8)^2 <= n.

Terms

a(0) =1a(1) =17a(2) =129a(3) =577a(4) =1713a(5) =3729a(6) =6865a(7) =12369a(8) =21697a(9) =33809a(10) =47921a(11) =69233a(12) =101041a(13) =136209a(14) =174737a(15) =231185a(16) =306049a(17) =384673a(18) =469457a(19) =579217a(20) =722353a(21) =876465a(22) =1025649a(23) =1220337a(24) =1481521a(25) =1733537a(26) =1979713a(27) =2306753a(28) =2697537a(29) =3087777