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A202510
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Number of zero-sum -7..7 arrays of n elements with first through third differences also in -7..7
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1
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1, 7, 57, 297, 1785, 11015, 68781, 436919, 2782455, 17852623, 114949893, 742430377, 4811939259, 31282061157, 203951966061, 1333111663347, 8732654184777, 57311401737559, 376739449264935, 2480070264283519, 16347300910687523
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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=7
..7....5...-4....3...-2....5....1....7....7...-2...-6....5....1...-5...-1....5
..3....4...-1....0....4...-1....5....6....5....1...-2....2...-3...-7....2....0
..0....1....3...-3....5...-2....6....2....3....2....1...-2...-3...-3....2...-2
.-5....1....2...-3....0...-2....2...-3....0....2....0...-3....1....3....2....1
.-6....0....2...-1...-5...-3...-1...-7...-3...-1...-1...-4....4....7....0....2
.-2...-4....1....0...-3....0...-6...-6...-5...-1....3...-2....2....6....0...-1
..3...-7...-3....4....1....3...-7....1...-7...-1....5....4...-2...-1...-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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