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A233870
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Number of (n+1)X(2+1) 0..7 arrays with every 2X2 subblock having the sum of the absolute values of all six edge and diagonal differences equal to 21
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1
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1176, 5404, 26488, 155104, 909408, 5878272, 36964980, 249710396, 1622032500, 11215026376, 74076824924, 518810087196, 3457277192904, 24385605821656, 163265938186764, 1156012704135280, 7758896886604512, 55050635581902056
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical recurrence of order 71 (see link above)
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EXAMPLE
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Some solutions for n=4
..2..5..2....6..1..7....6..3..1....6..6..3....6..0..6....0..3..7....0..3..6
..1..7..1....7..3..6....0..6..7....7..0..6....7..6..7....7..3..0....0..6..0
..1..4..7....1..6..0....3..6..0....2..2..5....6..0..6....3..0..6....7..6..3
..1..7..1....4..0..3....1..7..6....7..0..6....7..6..3....7..3..0....0..6..0
..0..1..0....4..7..3....6..3..1....3..3..0....3..1..7....3..0..6....3..6..3
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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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