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A266104
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Number of 4Xn integer arrays with each element equal to the number of horizontal and antidiagonal neighbors exactly one smaller than itself.
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1
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1, 39, 230, 929, 6307, 52171, 371130, 2568565, 18322421, 129531126, 926299920, 6712699992, 48087248218, 341400959047, 2440466698929, 17538694281014, 125725413376414, 899035671334963, 6432936252126858, 46077832832481217
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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=4
..1..0..0..0....1..0..1..1....0..1..2..0....1..0..1..1....0..0..1..1
..0..0..0..0....1..1..0..1....2..1..1..2....0..2..0..1....1..1..0..0
..0..0..0..0....2..1..2..0....0..2..1..1....1..0..2..1....1..0..0..1
..0..0..0..1....1..0..0..0....0..0..0..1....0..0..0..0....1..2..1..0
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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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