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A216990
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Number of city-block distance 1, pressure limit 2 movements in an nX7 array with each element moving exactly one horizontally or vertically, no element acquiring more than two neighbors, and without 2-loops
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1
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0, 12578, 24673352, 49491906456, 94821314531592, 180328865345987360, 342045101062468307160, 648338338792898616469226, 1228659499592627438742733120, 2328285492440707317251867198066
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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=3 (movement: 0=n 1=e 2=s 3=w)
..2..2..2..2..3..1..2....2..2..2..2..1..2..3....2..2..2..2..3..2..3
..1..1..2..1..2..3..3....1..1..2..1..0..3..0....2..1..2..2..3..2..0
..0..3..3..0..1..0..3....0..3..3..3..3..3..3....1..0..1..1..0..3..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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