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A146372
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0100-1111-0010 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 13, 27, 135, 531, 2573, 17743, 176473, 1599401, 23234641, 323134671, 6982586189, 150620917453, 4817580729223, 154870862911911
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OFFSET
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1,6
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.0.0.0.0.0.1.0.0
.0.0.0.0.1.1.1.1
.0.1.0.0.0.0.1.0
.1.1.1.1.0.1.0.0
.0.0.1.0.1.1.1.1
.0.1.0.0.0.0.1.0
.1.1.1.1.0.0.0.0
.0.0.1.0.0.0.0.0
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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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