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 A281966 Number of sets of exactly n positive integers <= n+3 having a square element sum. 2

%I #8 Feb 03 2017 19:50:43

%S 1,2,2,3,5,6,7,10,13,14,16,21,25,24,31,37,37,40,50,55,51,64,74,69,77,

%T 92,95,89,111,122,110,127,146,145,139,171,181,161,191,213,202,203,243,

%U 250,222,270,292,264,285,328,326,296,362,381,335,383,425,407,388

%N Number of sets of exactly n positive integers <= n+3 having a square element sum.

%H Alois P. Heinz, <a href="/A281966/b281966.txt">Table of n, a(n) for n = 0..1000</a>

%F a(n) = A281871(n+3,n).

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

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

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

%Y A diagonal of A281871.

%K nonn,look

%O 0,2

%A _Alois P. Heinz_, Feb 03 2017

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Last modified September 25 12:35 EDT 2023. Contains 365644 sequences. (Running on oeis4.)