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A147126
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1111-1000 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 3, 9, 23, 55, 223, 1115, 7199, 49215, 368043, 3428835, 40706551, 594200493, 10158791409, 204811760131, 4951116757551, 144268283766901
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OFFSET
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1,6
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.1
.0.0.0.0.1.1.1.1
.0.0.0.1.0.0.0.1
.0.0.0.1.0.0.0.1
.0.0.0.1.0.0.0.0
.0.0.1.1.1.1.0.0
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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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