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A146465
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0111-0100 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 77, 255, 1039, 4359, 18069, 81085, 437915, 2749579, 20046895, 155332489, 1345844489, 12832415197, 142867250585
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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
.0.0.0.0.1.1.0.0
.0.0.1.1.1.0.0.0
.0.1.0.0.1.0.0.1
.0.1.0.0.0.1.1.1
.1.1.1.0.0.0.1.0
.1.0.0.1.0.0.1.0
.0.0.0.1.1.1.0.0
.0.0.1.1.0.0.0.0
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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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