cp's OEIS Frontend

A187984 Number of nondecreasing arrangements of n numbers x(i) in -(n+3)..(n+3) with the sum of sign(x(i))*2^|x(i)| zero.

%I A187984 #15 Jun 15 2025 16:07:45
%S A187984 0,5,11,39,144,467,1673,5825,20404,72246,255137,905611,3220635,
%T A187984 11472797,40956011,146412581,524169045,1878990744,6743276222,
%U A187984 24225861208,87117117408,313552816720,1129460906243,4071526431770,14687417557462,53016891233217,191489301052386,692020548649474,2502200138127277,9051895373199102,32761105883346693
%N A187984 Number of nondecreasing arrangements of n numbers x(i) in -(n+3)..(n+3) with the sum of sign(x(i))*2^|x(i)| zero.
%e A187984 All solutions for n=3:
%e A187984 .-5...-6...-1...-2...-4...-4...-1...-3...-5...-3...-2
%e A187984 .-5....5...-1...-2...-4....3....0....2....4...-3....1
%e A187984 ..6....5....2....3....5....3....0....2....4....4....1
%Y A187984 Column 5 of A187988.
%K A187984 nonn
%O A187984 1,2
%A A187984 _R. H. Hardin_, Mar 18 2011
%E A187984 Terms from a(16) on by _R. J. Mathar_, May 17 2023