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A146608
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 3, 9, 21, 41, 85, 247, 661, 2133, 7669, 30043, 131633, 623713, 3176911, 18218893, 109622217, 754540743, 5491953507, 45422445535
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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 8 X 8 example
.0.0.0.0.1.1.0.0
.0.0.0.1.0.1.0.0
.1.1.1.1.0.1.0.0
.1.0.0.0.0.1.1.0
.0.1.1.0.0.0.0.1
.0.0.1.0.1.1.1.1
.0.0.1.0.1.0.0.0
.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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