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

Terms

a(0) =0a(1) =1a(2) =8a(3) =23a(4) =51a(5) =90a(6) =157a(7) =230a(8) =341a(9) =471a(10) =639a(11) =835a(12) =1063a(13) =1340a(14) =1671a(15) =2022a(16) =2443a(17) =2893a(18) =3428a(19) =4004a(20) =4653a(21) =5359a(22) =6133a(23) =6977a(24) =7907a(25) =8886a(26) =9991a(27) =11152a(28) =12428a(29) =13724