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A187985 Number of nondecreasing arrangements of n numbers x(i) in -(n+4)..(n+4) with the sum of sign(x(i))*2^|x(i)| zero 0
0, 6, 13, 49, 181, 597, 2166, 7592, 26835, 95590, 339475 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 6 of A187988

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

All solutions for n=3

.-7...-5...-2...-4...-3...-6...-2...-3...-1...-1...-6...-5...-4

..6....4...-2...-4...-3...-6....1....2...-1....0....5...-5....3

..6....4....3....5....4....7....1....2....2....0....5....6....3

CROSSREFS

Sequence in context: A247939 A203977 A003757 * A320043 A296619 A064521

Adjacent sequences:  A187982 A187983 A187984 * A187986 A187987 A187988

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 18 2011

STATUS

approved

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Last modified November 19 16:37 EST 2019. Contains 329323 sequences. (Running on oeis4.)