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

Terms

a(0) =0a(1) =0a(2) =1a(3) =7a(4) =17a(5) =38a(6) =78a(7) =127a(8) =196a(9) =296a(10) =410a(11) =564a(12) =738a(13) =958a(14) =1220a(15) =1514a(16) =1848a(17) =2235a(18) =2686a(19) =3175a(20) =3719a(21) =4365a(22) =5007a(23) =5758a(24) =6568a(25) =7442a(26) =8415a(27) =9477a(28) =10597a(29) =11779