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A146819
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1110-0111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 39, 117, 351, 957, 3341, 15997, 83175, 424759, 2415699, 15982837, 113541201, 873618675
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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
.0.1.1.1.0.0.0.0
.1.0.1.1.1.0.0.0
.1.1.0.0.1.0.0.0
.1.1.0.0.0.1.1.0
.0.1.1.0.0.0.1.1
.0.0.0.1.0.0.1.1
.0.0.0.1.1.1.0.1
.0.0.0.0.1.1.1.0
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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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