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A146159
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only either as two by three or three by two blocks.
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0
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1, 1, 1, 1, 7, 15, 60, 184, 747, 3499, 25726, 170389, 1816278, 17509129, 246038108, 3281197739, 66149680918, 1268005261759, 37496297507935, 1034674372954972, 43395951886928470
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OFFSET
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1,5
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.1.1.0.1.1.0.0.0
.1.1.0.1.1.0.1.1
.1.1.0.1.1.0.1.1
.0.0.0.0.0.0.1.1
.1.1.0.0.0.0.0.0
.1.1.0.1.1.0.1.1
.1.1.0.1.1.0.1.1
.0.0.0.1.1.0.1.1
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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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