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A146471
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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1110-0111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 13, 13, 69, 69, 457, 457, 6223, 6223, 127787, 127787, 3658281, 3658281, 163817453, 163817453, 11238713859, 11238713859, 1160267254915, 1160267254915
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OFFSET
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1,9
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LINKS
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EXAMPLE
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Maximal 9 X 9 example
.0.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0.0
.0.1.1.1.0.1.1.1.0
.1.1.1.0.0.0.1.1.1
.0.0.0.0.0.0.0.0.0
.1.1.1.0.0.0.1.1.1
.0.1.1.1.0.1.1.1.0
.0.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0.0
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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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