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A141483
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Number of n X n binary matrices, symmetric under horizontal and vertical reflection, with no more than 1 one in any 2 X 2 subblock.
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1
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1, 2, 1, 5, 2, 35, 5, 314, 35, 6427, 314, 202841, 6427, 12727570, 202841, 1355115601, 12727570, 269718819131, 1355115601, 94707789944544, 269718819131, 60711713670028729, 94707789944544, 69645620389200894313
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OFFSET
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0,2
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COMMENTS
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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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