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A144238
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Number of n X n binary arrays, symmetric under horizontal and vertical reflection, 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, 3, 2, 6, 14, 111, 56, 1337, 718, 24951, 27864, 1478458, 1080087, 130135921, 85888038, 18349790023, 15914995870, 5514906021024, 4665956204109
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listen;
history;
text;
internal format)
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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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