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A147409
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1001-1001-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 7, 13, 21, 31, 61, 147, 365, 1043, 3041, 10027, 33377, 115807, 406723, 1580475, 6700609
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OFFSET
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1,10
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LINKS
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EXAMPLE
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Maximal 10 X 10 example
.0.0.0.1.0.0.1.0.0.0
.0.0.0.1.0.0.1.0.0.0
.0.0.0.1.1.1.1.0.0.0
.1.1.1.0.0.0.0.1.1.1
.0.0.1.0.0.0.0.1.0.0
.0.0.1.0.0.0.0.1.0.0
.1.1.1.0.0.0.0.1.1.1
.0.0.0.1.1.1.1.0.0.0
.0.0.0.1.0.0.1.0.0.0
.0.0.0.1.0.0.1.0.0.0
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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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