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A199843
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Number of -4..4 arrays x(0..n-1) of n elements with zero sum and no element more than one greater than the previous
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1
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1, 5, 18, 68, 239, 845, 2958, 10349, 36111, 126121, 441161, 1546353, 5432430, 19130949, 67536934, 238991556, 847646318, 3012890719, 10730694626, 38289978058, 136865206035, 489995352710, 1756812943841, 6307268945198
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OFFSET
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1,2
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COMMENTS
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Column 4 of A199847
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..200
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EXAMPLE
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Some solutions for n=6
..2....1....3....3....1....1....3....2....3...-1....3....4....0....2....2....3
..3....2....2....4...-1....2....2....3....0....0....1....3....0....2....0....4
..4....2....0...-1....0....2....2...-1....1....1....2....0....1....1....1...-1
.-2...-2....1....0....1....1....0...-1....2....1...-1...-2....2....2....1...-3
.-4...-2...-3...-2....1...-2...-3...-2...-2...-1...-1...-1...-1...-3...-1...-2
.-3...-1...-3...-4...-2...-4...-4...-1...-4....0...-4...-4...-2...-4...-3...-1
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CROSSREFS
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Sequence in context: A225015 A166677 A158879 * A109438 A164051 A134764
Adjacent sequences: A199840 A199841 A199842 * A199844 A199845 A199846
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Nov 11 2011
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STATUS
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approved
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