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A147135
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1001-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 59, 157, 473, 1581, 5917, 23197, 94123, 435079, 2125669
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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
.0.0.0.1.1.1.1.0.0
.0.0.0.1.0.0.1.0.0
.0.0.0.1.0.0.0.1.1
.1.1.1.0.0.0.0.0.1
.1.0.0.0.0.0.0.0.1
.1.0.0.0.0.0.1.1.1
.1.1.0.0.0.1.0.0.0
.0.0.1.0.0.1.0.0.0
.0.0.1.1.1.1.0.0.0
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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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