A281968 - OEIS

%I #6 Feb 03 2017 19:58:19

%S 1,2,4,8,14,24,39,60,86,121,171,228,294,387,499,614,762,953,1152,1362,

%T 1654,1979,2280,2678,3167,3628,4117,4798,5498,6109,6968,7967,8824,

%U 9793,11127,12382,13462,15088,16845,18230,19981,22294,24272,26047,28849,31616

%N Number of sets of exactly n positive integers <= n+5 having a square element sum.

%H Alois P. Heinz, <a href="/A281968/b281968.txt">Table of n, a(n) for n = 0..1000</a>

%F a(n) = A281871(n+5,n).

%e a(2) = 4: {1,3}, {2,7}, {3,6}, {4,5}.

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

%e a(4) = 14: {1,2,4,9}, {1,2,5,8}, {1,2,6,7}, {1,3,4,8}, {1,3,5,7}, {1,4,5,6}, {1,7,8,9}, {2,3,4,7}, {2,3,5,6}, {2,6,8,9}, {3,5,8,9}, {3,6,7,9}, {4,5,7,9}, {4,6,7,8}.

%Y A diagonal of A281871.

%K nonn

%O 0,2

%A _Alois P. Heinz_, Feb 03 2017