Number of nonnegative solutions of x1^2 + x2^2 + ... + x9^2 = n.

Terms

a(0) =1a(1) =9a(2) =36a(3) =84a(4) =135a(5) =198a(6) =336a(7) =540a(8) =675a(9) =766a(10) =1080a(11) =1584a(12) =1857a(13) =1962a(14) =2520a(15) =3480a(16) =3987a(17) =3987a(18) =4656a(19) =6300a(20) =7326a(21) =7182a(22) =8064a(23) =10656a(24) =12063a(25) =11583a(26) =12672a(27) =16116a(28) =18180a(29) =17784