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A199846
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Number of -7..7 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, 8, 41, 206, 944, 4188, 17879, 74424, 303400, 1218440, 4833416, 18992142, 74057460, 287035502, 1107086841, 4253339267, 16289667330, 62230152461, 237255014892, 903101912666, 3433312226666, 13039708953325, 49488269035164
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=6
..4....4....6....7....6....4....3....4....4....6....6...-1....4....6....4....6
..2....4....2...-2....4....4....3....4....5....2....7....0....4....5....5....6
..1....0....2...-2....0...-2....2....1....4....2...-1....1....4....2....6...-1
.-1...-1...-3...-2...-1...-1...-1...-3...-1...-4...-1....2....1...-5...-4...-2
..0...-4...-2...-1...-4....0...-1...-2...-5...-3...-5....0...-7...-4...-6...-4
.-6...-3...-5....0...-5...-5...-6...-4...-7...-3...-6...-2...-6...-4...-5...-5
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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