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A146269
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Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 110-111-110 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 2, 1, 4, 1, 8, 3, 26, 9, 95, 20, 374, 59, 1990, 238, 12488, 1339, 98678, 8950, 945523, 63227, 10649014, 541368, 148952527
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OFFSET
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1,7
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LINKS
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EXAMPLE
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Maximal 9 X 9 example
.0.0.0.0.1.0.0.0.0
.0.0.0.1.1.1.0.0.0
.0.0.0.1.1.1.0.0.0
.0.1.1.0.0.0.1.1.0
.1.1.1.0.0.0.1.1.1
.0.1.1.0.0.0.1.1.0
.0.0.0.1.1.1.0.0.0
.0.0.0.1.1.1.0.0.0
.0.0.0.0.1.0.0.0.0
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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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