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A144239
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Number of n X n binary arrays, symmetric about main diagonal, 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, 3, 9, 28, 108, 984, 7649, 73052, 1440611, 30613610, 770498233, 33712608974, 1836317274474, 122794791129401, 12495584324152671, 1697400189654813806
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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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