Number of nonnegative solutions to (x_1)^2 + (x_2)^2 + ... + (x_6)^2 <= n.

Terms

a(0) =1a(1) =7a(2) =22a(3) =42a(4) =63a(5) =99a(6) =160a(7) =220a(8) =265a(9) =337a(10) =457a(11) =577a(12) =672a(13) =792a(14) =978a(15) =1178a(16) =1319a(17) =1469a(18) =1739a(19) =2039a(20) =2255a(21) =2507a(22) =2882a(23) =3242a(24) =3513a(25) =3819a(26) =4269a(27) =4769a(28) =5159a(29) =5555