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A187982 Number of nondecreasing arrangements of n numbers x(i) in -(n+1)..(n+1) with the sum of sign(x(i))*2^|x(i)| zero 0
0, 3, 7, 22, 82, 260, 912, 3158, 10920, 38385, 134652, 474953 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A187988

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=4

.-5...-3...-5...-4...-4...-4...-5...-4...-5...-4...-3...-3...-2...-3...-2...-5

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

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

..5....4....5....4....4....5....5....4....5....3....2....3....2....3....1....5

CROSSREFS

Sequence in context: A111772 A233005 A018190 * A000228 A108070 A038147

Adjacent sequences:  A187979 A187980 A187981 * A187983 A187984 A187985

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 18 2011

STATUS

approved

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Last modified February 21 22:56 EST 2018. Contains 299427 sequences. (Running on oeis4.)