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A188230 Number of nondecreasing arrangements of n numbers in -(n+1)..(n+1) with sum zero and not more than two numbers equal 1
1, 4, 12, 52, 221, 1019, 4818, 23522, 117209, 594789, 3062414, 15966168, 84132345, 447457816, 2399177028, 12956403904, 70416558196, 384897011042, 2114694606220, 11672750655842, 64705139473661, 360068911514032, 2010827078176568 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A188236

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..30

EXAMPLE

Some solutions for n=4

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

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

..1....5....1....2....1....0....1....2....2....3....1....3....2....2....3....2

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

CROSSREFS

Sequence in context: A259274 A109499 A282587 * A124006 A215524 A034716

Adjacent sequences:  A188227 A188228 A188229 * A188231 A188232 A188233

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 24 2011

STATUS

approved

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Last modified September 20 17:42 EDT 2021. Contains 347588 sequences. (Running on oeis4.)