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 A223728 #4 Mar 27 2013 11:26:52 %S A223728 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,3,1,1,1,1,1,1,2,1,1,2,2,1,2,3,2,1,1,1, %T A223728 3,2,1,3,1,1,1,2,1,1,2,1,5,1,2,3,1,1,2,3,1,2,1,1,2,4,2,1,2,3,1,5,2,2, %U A223728 2,2,2,4,3,1,4,1,1,4,2,2,2,5,3,1,6,3,3,1,2,1,1,4,4,2,5,1,3,7,3,2 %N A223728 Multiplicities for A223727: primitive sums of four distinct nonzero squares. %C A223728 A223728(n) has a(n) different primitive representations as sum of four distinct nonzero squares, n>=1. %F A223728 a(n) = k if there are k different solutions for A223728(n) = sum(s(j)^2, j=1..4), with 0 < s(1) < s(2) < s(3) < s(4) and gcd(s(1),s(2),s(3),s(4)) = 1. %e A223728 a(16) = 3 because A223727(16) = 78 has three s-quadruples, namely [1, 2, 3, 8], [1, 4, 5, 6] and [2, 3, 4, 7]. %e A223728 a(23) = 2 from A223727(23) = 90 with s-quadruples [1, 2, 6, 7] and [1, 3, 4, 8]. %Y A223728 Cf. A223727, A223726. %K A223728 nonn %O A223728 1,16 %A A223728 _Wolfdieter Lang_, Mar 27 2013