This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A372511 #6 May 04 2024 15:00:11
%S A372511 0,0,1,1,1,1,1,1,1,1,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,6,6,6,6,6,6,6,6,
%T A372511 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,11,11,11,11,11,11,11,11,13,13,13,13,
%U A372511 13,13,13,13,13,13,13,13,13,13,13,13,15,15,15,15,15,15,15,15,17,17,17,17
%N A372511 Number of solutions to x^2 + y^2 <= n, where x, y are positive odd integers.
%H A372511 <a href="/index/Su#ssq">Index entries for sequences related to sums of squares</a>
%t A372511 nmax = 85; CoefficientList[Series[EllipticTheta[2, 0, x^4]^2/(4 (1 - x)), {x, 0, nmax}], x]
%Y A372511 Cf. A008442, A057655, A224212, A237526, A290081, A349609, A372512.
%K A372511 nonn
%O A372511 0,11
%A A372511 _Ilya Gutkovskiy_, May 04 2024