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A144244
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Number of n X n binary arrays, symmetric under 180 degree rotation, with every 1 adjacent to at least one other 1 both bishopwise and rookwise but with no three 1s in a row bishopwise or rookwise.
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0
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1, 2, 1, 9, 24, 94, 870, 7731, 58940, 1518701, 25116276, 780979887, 31966477480
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OFFSET
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1,2
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LINKS
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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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