Number of nonnegative solutions to (x_1)^2 + (x_2)^2 + ... + (x_7)^2 <= n.

Terms

a(0) =1a(1) =8a(2) =29a(3) =64a(4) =106a(5) =169a(6) =281a(7) =422a(8) =548a(9) =702a(10) =961a(11) =1276a(12) =1556a(13) =1864a(14) =2326a(15) =2893a(16) =3390a(17) =3852a(18) =4545a(19) =5455a(20) =6253a(21) =7002a(22) =8080a(23) =9361a(24) =10453a(25) =11496a(26) =12903a(27) =14618a(28) =16194a(29) =17643