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A147229
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11011-01110 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 4, 9, 18, 29, 62, 159, 552, 1625, 6033, 18370, 76478, 293679, 1560810, 7445670, 46344151, 251751509, 1816985360, 11749000262
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OFFSET
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1,7
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.0.0.0.0.0.1.0.0
.0.1.1.1.0.1.1.0
.1.1.0.1.1.0.1.0
.0.0.1.0.0.1.1.0
.0.1.1.0.0.1.0.0
.0.1.0.1.1.0.1.1
.0.1.1.0.1.1.1.0
.0.0.1.0.0.0.0.0
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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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