cp's OEIS Frontend

A187991 Number of nondecreasing arrangements of 7 numbers x(i) in -(n+5)..(n+5) with the sum of sign(x(i))*2^|x(i)| zero.

%I A187991 #11 Jul 23 2023 22:22:28
%S A187991 411,632,912,1257,1673,2166,2742,3407,4167,5028,5996,7077,8277,9602,
%T A187991 11058,12651,14387,16272,18312,20513,22881,25422,28142,31047,34143,
%U A187991 37436,40932,44637,48557,52698
%N A187991 Number of nondecreasing arrangements of 7 numbers x(i) in -(n+5)..(n+5) with the sum of sign(x(i))*2^|x(i)| zero.
%C A187991 Row 7 of A187988.
%e A187991 Some solutions for n=3:
%e A187991   -7  -8  -7  -1  -6  -8  -8  -7  -4  -6  -7  -5  -8  -7  -8  -6
%e A187991   -4  -5  -2  -1  -3  -5  -6  -5  -2  -3  -5  -3  -3  -7  -3  -5
%e A187991   -4  -1  -2  -1  -1   2  -1  -3  -2  -3   4   1  -2  -7  -3  -4
%e A187991   -4   0   1  -1   1   2   0   3  -2   2   4   1  -2   6   4   4
%e A187991    4   0   1   1   2   3   0   5  -1   2   5   1   3   6   6   5
%e A187991    5   5   2   1   2   4   6   6  -1   3   5   1   3   7   6   5
%e A187991    7   8   7   2   6   8   8   6   5   6   6   5   8   7   7   5
%K A187991 nonn
%O A187991 1,1
%A A187991 _R. H. Hardin_, Mar 18 2011
%E A187991 a(26) corrected by _R. J. Mathar_, May 11 2023