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A146222
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 101-111-010 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 8, 19, 32, 59, 168, 529, 2001, 7331, 32274, 148084, 749186, 4153139, 26410348, 177997054, 1409667475, 11785334777, 115210607000, 1184859282420, 13940662127003
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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
.0.0.0.0.1.0.1.0
.1.1.0.0.1.1.1.0
.0.1.1.0.0.1.0.0
.1.1.0.0.0.0.0.0
.0.0.0.0.0.0.1.1
.0.0.1.0.0.1.1.0
.0.1.1.1.0.0.1.1
.0.1.0.1.0.0.0.0
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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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