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 A298939 #4 Jan 29 2018 21:12:37
%S A298939 1,1,1,4,1,286,7582,202028,6473625,226029577,8338249868,391526193477,
%T A298939 19990594900630,1159906506684446,74890158861242740,
%U A298939 5119732406649036418,380146984328280974281,30198665638519565614034,2555354508318427693497565
%N A298939 Number of ordered ways of writing n^3 as a sum of n squares of positive integers.
%H A298939 <a href="/index/Su#ssq">Index entries for sequences related to sums of squares</a>
%F A298939 a(n) = [x^(n^3)] (Sum_{k>=1} x^(k^2))^n.
%e A298939 a(3) = 4 because we have [25, 1, 1], [9, 9, 9], [1, 25, 1] and [1, 1, 25].
%t A298939 Table[SeriesCoefficient[(-1 + EllipticTheta[3, 0, x])^n/2^n, {x, 0, n^3}], {n, 0, 18}]
%Y A298939 Cf. A000290, A000578, A006456, A030273, A037444, A066535, A218494, A232173, A287617, A298329, A298330, A298935, A298937, A298938.
%K A298939 nonn
%O A298939 0,4
%A A298939 _Ilya Gutkovskiy_, Jan 29 2018