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A147458
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11000-01111-11000 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 3, 9, 21, 34, 61, 142, 363, 998, 3151, 10096, 34473, 121095, 493961, 2091176, 9966879, 48888970, 265507652
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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
.0.0.0.1.1.0.1.0
.1.1.1.1.0.0.1.0
.0.0.0.1.1.0.1.0
.1.0.1.0.0.1.1.1
.1.1.1.0.0.1.0.1
.0.1.0.1.1.0.0.0
.0.1.0.0.1.1.1.1
.0.1.0.1.1.0.0.0
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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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