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A146271
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-111-110 pattern in any orientation.
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0
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1, 1, 1, 1, 5, 17, 56, 271, 962, 4903, 45104, 358857, 4309512, 55284185, 919547239, 17250892544, 432277811298, 11665546694793, 439099597024204
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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
.0.0.0.0.0.1.1.1
.0.0.0.0.0.1.1.1
.0.1.1.1.0.0.1.0
.0.1.1.1.0.1.0.0
.0.0.1.0.1.1.1.0
.0.1.0.0.1.1.1.0
.1.1.1.0.0.0.0.0
.1.1.1.0.0.0.0.0
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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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