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A141509
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Number of n X n binary matrices, symmetric under horizontal reflection, with no more than 3 ones in any 2 X 2 subblock.
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1
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1, 2, 3, 57, 128, 22077, 65205, 114142368, 468343535, 7969215344753, 44467930404864, 7479088292930771309, 57134805472751200753, 94492733598842569249024512, 986251920362343910672065291
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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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