cp's OEIS Frontend

A187986 Number of nondecreasing arrangements of n numbers x(i) in -(n+5)..(n+5) with the sum of sign(x(i))*2^|x(i)| zero.

%I A187986 #11 Jun 15 2025 17:24:07
%S A187986 0,7,15,60,222,746,2742,9689,34588,124062,443469,1591177,5710783,
%T A187986 20514746,73779819,265523140,956384656,3447285428,12433999199,
%U A187986 44877035870,162066465738,585603996081,2117103447068,7657611562951,27710598382843,100320181906860,363337451934873,1316442508560564
%N A187986 Number of nondecreasing arrangements of n numbers x(i) in -(n+5)..(n+5) with the sum of sign(x(i))*2^|x(i)| zero.
%e A187986 All solutions for n=3
%e A187986 .-8...-1...-3...-6...-2...-4...-7...-7...-4...-2...-5...-5...-3...-1...-6
%e A187986 ..7....0...-3....5....1...-4...-7....6....3...-2....4...-5....2...-1...-6
%e A187986 ..7....0....4....5....1....5....8....6....3....3....4....6....2....2....7
%Y A187986 Column 7 of A187988.
%K A187986 nonn
%O A187986 1,2
%A A187986 _R. H. Hardin_, Mar 18 2011
%E A187986 More terms from _R. J. Mathar_, May 17 2023