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A183915 Number of nondecreasing arrangements of n numbers in -7..7 with sum zero 2
1, 8, 32, 126, 414, 1242, 3370, 8512, 20094, 44916, 95514, 194668, 381676, 723354, 1328980, 2374753, 4136477, 7040196, 11728606, 19159798, 30734578, 48479188, 75277670, 115195490, 173885716, 259140928, 381577586, 555546058, 800247348 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 7 of A183917

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..71

EXAMPLE

Some solutions for n=4

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

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

..2....0....4....0....1....4....0....4....2....3....3....1....1....0....7....1

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

CROSSREFS

Sequence in context: A196097 A234272 A269077 * A325839 A081654 A307004

Adjacent sequences:  A183912 A183913 A183914 * A183916 A183917 A183918

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 07 2011

STATUS

approved

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Last modified October 16 15:17 EDT 2021. Contains 348042 sequences. (Running on oeis4.)