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A188231 Number of nondecreasing arrangements of n numbers in -(n+2)..(n+2) with sum zero and not more than two numbers equal 1
1, 5, 17, 81, 374, 1818, 8964, 45225, 231596, 1202495, 6313385, 33473871, 178991409, 964308854, 5229780968, 28531772394, 156491164870, 862470267275, 4774186037351, 26533145487533, 148001670048543, 828332995017980 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A188236

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..28

EXAMPLE

Some solutions for n=5

.-4...-6...-3...-6...-7...-7...-4...-4...-6...-7...-5...-3...-7...-7...-7...-4

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

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

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

..5....7....7....7....5....5....7....5....4....6....7....6....5....6....6....5

CROSSREFS

Sequence in context: A179605 A149751 A303713 * A023253 A149752 A149753

Adjacent sequences:  A188228 A188229 A188230 * A188232 A188233 A188234

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 24 2011

STATUS

approved

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Last modified October 20 19:34 EDT 2021. Contains 348118 sequences. (Running on oeis4.)