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 A281971 #6 Feb 03 2017 20:07:41
%S A281971 1,3,7,20,49,110,227,435,786,1358,2259,3621,5627,8538,12655,18318,
%T A281971 26049,36487,50236,68131,91412,121207,158659,205768,264786,337240,
%U A281971 425738,534408,665866,822789,1011364,1237211,1502645,1814854,2184786,2615980,3114026,3695678
%N A281971 Number of sets of exactly n positive integers <= n+8 having a square element sum.
%H A281971 Alois P. Heinz, <a href="/A281971/b281971.txt">Table of n, a(n) for n = 0..1000</a>
%F A281971 a(n) = A281871(n+8,n).
%e A281971 a(2) = 7: {1,3}, {1,8}, {2,7}, {3,6}, {4,5}, {6,10}, {7,9}.
%e A281971 a(3) = 20: {1,2,6}, {1,3,5}, {1,4,11}, {1,5,10}, {1,6,9}, {1,7,8}, {2,3,4}, {2,3,11}, {2,4,10}, {2,5,9}, {2,6,8}, {3,4,9}, {3,5,8}, {3,6,7}, {4,5,7}, {4,10,11}, {5,9,11}, {6,8,11}, {6,9,10}, {7,8,10}.
%Y A281971 A diagonal of A281871.
%K A281971 nonn
%O A281971 0,2
%A A281971 _Alois P. Heinz_, Feb 03 2017