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A146255
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-111-011 pattern in any orientation.
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0
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1, 1, 3, 1, 5, 9, 27, 79, 359, 979, 7545, 28031, 289781, 1662565, 22704081, 184816617, 3459666973, 37715425193, 1006494628185, 14994761556409, 556041103278131, 11700677821513253
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OFFSET
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1,3
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.0.0.0.0.0.1.1.0
.0.0.0.0.1.1.1.0
.0.1.1.0.1.1.0.0
.1.1.1.0.0.0.1.1
.1.1.0.0.0.1.1.1
.0.0.1.1.0.1.1.0
.0.1.1.1.0.0.0.0
.0.1.1.0.0.0.0.0
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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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