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 A276287 #11 Feb 16 2025 08:33:36
%S A276287 1,30,420,3640,21870,96936,331240,911040,2128260,4495430,8972712,
%T A276287 16946280,29822520,49476840,80027280,127083328,193511790,282611280,
%U A276287 409172940,590913960,825736296,1115671760,1509537960,2048372160,2698852520,3463029894
%N A276287 Number of ways of writing n as a sum of 15 squares.
%H A276287 Seiichi Manyama, <a href="/A276287/b276287.txt">Table of n, a(n) for n = 0..10000</a>
%H A276287 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SumofSquaresFunction.html">Sum of Squares Function</a>
%H A276287 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/JacobiThetaFunctions.html">Jacobi Theta Functions</a>
%H A276287 <a href="/index/Su#ssq">Index entries for sequences related to sums of squares</a>
%F A276287 G.f.: theta_3(0,q)^15, where theta_3(x,q) is the third Jacobi theta function.
%t A276287 Table[SquaresR[15, n], {n, 0, 28}]
%Y A276287 Cf. similar sequences of number of ways of writing n as a sum of k squares listed in A276285.
%Y A276287 15th column of A286815.
%K A276287 nonn,easy
%O A276287 0,2
%A A276287 _Ilya Gutkovskiy_, Aug 27 2016