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A188229 Number of nondecreasing arrangements of n numbers in -n..n with sum zero and not more than two numbers equal 1
1, 3, 7, 30, 119, 527, 2395, 11376, 55368, 275735, 1397063, 7185356, 37419881, 196993233, 1046785509, 5608211846, 30264466262, 164375822152, 897938065590, 4930713542112, 27202861579741, 150721902660263, 838367664692809 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A188236

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..31

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A227077 A136934 A201794 * A277739 A098644 A182322

Adjacent sequences:  A188226 A188227 A188228 * A188230 A188231 A188232

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 24 2011

STATUS

approved

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Last modified October 25 01:40 EDT 2021. Contains 348233 sequences. (Running on oeis4.)