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%I #6 Feb 03 2017 19:53:56
%S 1,2,3,5,8,13,19,25,34,47,58,70,92,113,130,156,194,218,246,299,343,
%T 373,430,508,543,596,701,765,813,920,1047,1090,1181,1365,1436,1509,
%U 1697,1865,1915,2068,2349,2411,2522,2832,3017,3076,3331,3705,3743,3918,4389
%N Number of sets of exactly n positive integers <= n+4 having a square element sum.
%H Alois P. Heinz, <a href="/A281967/b281967.txt">Table of n, a(n) for n = 0..1000</a>
%F a(n) = A281871(n+4,n).
%e a(2) = 3: {1,3}, {3,6}, {4,5}.
%e a(3) = 5: {1,2,6}, {1,3,5}, {2,3,4}, {3,6,7}, {4,5,7}.
%e a(4) = 8: {1,2,5,8}, {1,2,6,7}, {1,3,4,8}, {1,3,5,7}, {1,4,5,6}, {2,3,4,7}, {2,3,5,6}, {4,6,7,8}.
%Y A diagonal of A281871.
%K nonn
%O 0,2
%A _Alois P. Heinz_, Feb 03 2017
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