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A147432
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1010-1111-0101 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 3, 7, 13, 21, 39, 91, 251, 693, 2197, 6837, 23871, 89603, 379705, 1672695, 8302957, 42265243, 244734851, 1469763313
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OFFSET
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1,9
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LINKS
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EXAMPLE
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Maximal 9 X 9 example
.0.0.0.0.1.0.1.0.0
.0.0.0.1.1.1.1.0.0
.0.0.0.1.0.1.0.1.1
.0.1.1.0.0.0.1.1.0
.1.1.0.0.0.0.0.1.1
.0.1.1.0.0.0.1.1.0
.1.1.0.1.0.1.0.0.0
.0.0.1.1.1.1.0.0.0
.0.0.1.0.1.0.0.0.0
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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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