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A147105
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1100-0111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 3, 13, 21, 51, 105, 313, 705, 2345, 6341, 26177, 91001, 474255, 1837677, 10745995, 49191077, 334389565, 1781473499
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OFFSET
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1,8
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.0.0.0.1.1.1.0.0
.0.0.1.1.0.0.0.0
.1.0.1.0.1.1.1.0
.1.0.1.0.0.0.1.1
.1.1.0.0.0.1.0.1
.0.1.1.1.0.1.0.1
.0.0.0.0.1.1.0.0
.0.0.1.1.1.0.0.0
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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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