Number of nonnegative solutions to x^2 + y^2 + z^2 <= n^2.

Terms

a(0) =1a(1) =4a(2) =11a(3) =29a(4) =54a(5) =99a(6) =163a(7) =239a(8) =344a(9) =486a(10) =648a(11) =847a(12) =1069a(13) =1355a(14) =1680a(15) =2046a(16) =2446a(17) =2911a(18) =3443a(19) =4022a(20) =4662a(21) =5395a(22) =6145a(23) =6998a(24) =7913a(25) =8913a(26) =10006a(27) =11194a(28) =12437a(29) =13751