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A232157
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Number of nX4 0..3 arrays with every 0 next to a 1, every 1 next to a 2 and every 2 next to a 3 horizontally, vertically or antidiagonally, and no adjacent values equal
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1
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8, 218, 1284, 7770, 46702, 286770, 1767266, 10830650, 66701686, 410364610, 2522566124, 15524673872, 95489164864, 587352257166, 3613537440642, 22227593479382, 136734516680534, 841147631122416, 5174280907720634
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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 94 (see link above)
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EXAMPLE
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Some solutions for n=5
..1..3..2..3....1..3..2..1....3..0..1..3....1..3..0..2....0..3..1..2
..2..0..1..2....2..1..3..0....1..2..0..1....2..1..3..1....1..2..0..3
..1..3..0..1....3..0..2..1....3..1..3..2....0..2..0..3....3..1..2..1
..2..1..2..0....2..1..0..3....2..0..1..3....1..3..2..1....2..0..3..2
..0..3..1..3....0..3..1..2....3..2..0..2....0..1..3..2....1..2..0..1
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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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