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

Terms

a(0) =1a(1) =3a(2) =6a(3) =11a(4) =17a(5) =26a(6) =35a(7) =45a(8) =58a(9) =73a(10) =90a(11) =106a(12) =123a(13) =146a(14) =168a(15) =193a(16) =216a(17) =243a(18) =271a(19) =302a(20) =335a(21) =365a(22) =402a(23) =437a(24) =473a(25) =516a(26) =557a(27) =600a(28) =642a(29) =687