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A141503
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Number of n X n binary matrices, symmetric under horizontal reflection, with no more than 2 ones in any 2 X 2 subblock.
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1
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1, 2, 3, 35, 85, 5529, 17421, 6468501, 30238457, 64377477751, 410142991045, 5056537169718019, 45365538098494225, 3235038360513128954137, 40254614759516328904462, 16631279103859270471807630795
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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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