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A147411
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Number of n X n binary arrays symmetric under 90 degree rotation 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, 5, 13, 27, 43, 73, 179, 423, 1083, 3071, 10101, 37829, 144853, 562367, 2218397, 9164725, 42914033, 209532563
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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
.1.0.0.1.0.1.1.1
.1.0.0.1.0.1.0.0
.1.1.1.1.0.1.0.0
.0.0.0.0.0.1.1.1
.1.1.1.0.0.0.0.0
.0.0.1.0.1.1.1.1
.0.0.1.0.1.0.0.1
.1.1.1.0.1.0.0.1
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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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