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A146600
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 5, 19, 39, 83, 233, 711, 2313, 8511, 40097, 191977, 1081845, 6288993, 41547129, 292524045, 2387601825, 20697818111
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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:
.1.0.0.0.0.1.1.1
.1.0.0.0.0.1.0.0
.1.1.1.1.0.1.0.0
.0.0.0.0.0.1.0.0
.0.0.1.0.0.0.0.0
.0.0.1.0.1.1.1.1
.0.0.1.0.0.0.0.1
.1.1.1.0.0.0.0.1
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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