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A183913 Number of nondecreasing arrangements of n numbers in -5..5 with sum zero 2
1, 6, 18, 55, 141, 338, 734, 1514, 2934, 5448, 9686, 16660, 27718, 44916, 70922, 109583, 165821, 246448, 360002, 517971, 734517, 1028172, 1421530, 1943488, 2628824, 3521260, 4672836, 6147894, 8022362, 10388788, 13355414, 17052653 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 5 of A183917

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n)=a(n-1)+2*a(n-2)-a(n-3)-a(n-4)-a(n-5)+a(n-9)-a(n-10)+3*a(n-12)+a(n-13)-a(n-14)-a(n-16)-2*a(n-17)-a(n-18)-a(n-20)+a(n-22)+2*a(n-23)+2*a(n-24)+a(n-25)-a(n-27)-a(n-29)-2*a(n-30)-a(n-31)-a(n-33)+a(n-34)+3*a(n-35)-a(n-37)+a(n-38)-a(n-42)-a(n-43)-a(n-44)+2*a(n-45)+a(n-46)-a(n-47)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A099856 A007206 A292295 * A056349 A278768 A035070

Adjacent sequences:  A183910 A183911 A183912 * A183914 A183915 A183916

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 07 2011

STATUS

approved

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Last modified November 18 10:33 EST 2017. Contains 294887 sequences.