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A141514
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Number of n X n binary matrices, symmetric under 180 degree rotation, with no more than 3 ones in any 2 X 2 subblock.
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1
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1, 2, 3, 29, 176, 5621, 122557, 14694960, 1181467639, 516777127561, 152237306877120, 244601068560037129, 264412894413046723521, 1557984885076079288613088, 6177872087977594821120364739
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OFFSET
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0,2
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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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