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Number of sets of exactly n positive integers <= n+10 having a square element sum.
2

%I #5 Feb 03 2017 20:52:02

%S 1,3,9,33,93,242,568,1237,2532,4905,9071,16113,27654,45997,74388,

%T 117408,181271,274163,407066,594568,855087,1211979,1695785,2344564,

%U 3204123,4332497,5802690,7699864,10126446,13212343,17109772,21991217,28071644,35611707,44895662

%N Number of sets of exactly n positive integers <= n+10 having a square element sum.

%H Alois P. Heinz, <a href="/A281973/b281973.txt">Table of n, a(n) for n = 0..1000</a>

%F a(n) = A281871(n+10,n).

%e a(0) = 1: {}.

%e a(1) = 3: {1}, {4}, {9}.

%e a(2) = 9: {1,3}, {1,8}, {2,7}, {3,6}, {4,5}, {4,12}, {5,11}, {6,10}, {7,9}.

%Y A diagonal of A281871.

%K nonn

%O 0,2

%A _Alois P. Heinz_, Feb 03 2017