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A302474
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Number of 4Xn 0..1 arrays with every element equal to 1, 2, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
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2
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0, 34, 250, 1401, 10264, 78679, 584333, 4330427, 32116855, 238854305, 1774890111, 13186901755, 97987405188, 728115173717, 5410378555145, 40202636764567, 298731900955463, 2219776401635593, 16494405056538952, 122564331015474402
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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 63 (see link above)
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EXAMPLE
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Some solutions for n=5
..0..0..1..1..0. .0..1..0..0..1. .0..0..0..1..1. .0..0..1..1..0
..1..1..1..0..1. .1..0..1..1..0. .1..1..0..0..1. .1..1..1..0..0
..0..1..0..0..0. .0..0..1..1..0. .0..1..1..0..1. .1..0..1..0..1
..0..0..1..1..0. .0..1..1..0..0. .0..0..0..1..1. .0..0..0..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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