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A279980
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Number of 4Xn 0..1 arrays with no element equal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
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1
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0, 31, 296, 1922, 10491, 50690, 226771, 963728, 3941732, 15655280, 60749739, 231325874, 867192006, 3208394065, 11737643962, 42526452550, 152777627539, 544782076812, 1929805835927, 6795769111934, 23804414728200, 82983605105905
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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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FORMULA
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Empirical recurrence of order 68 (see link above)
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EXAMPLE
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Some solutions for n=4
..0..0..1..0. .0..1..1..0. .0..1..0..1. .0..1..1..0. .0..1..0..0
..1..0..0..1. .1..0..1..1. .1..0..1..0. .1..0..1..1. .0..1..0..1
..0..1..1..0. .1..0..0..1. .0..0..1..0. .1..1..0..0. .0..0..1..0
..0..0..1..1. .1..1..0..0. .1..0..0..1. .1..0..1..0. .1..1..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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