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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: A016089 A099856 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 December 2 07:55 EST 2022. Contains 358493 sequences. (Running on oeis4.)