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A146020
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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 2 X 4 el 1,1 1,2 1,3 1,4 2,4 with any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 13, 13, 41, 41, 219, 219, 1033, 1033, 8217, 8217, 92671, 92671, 1241193, 1241193, 21102313
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OFFSET
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1,11
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LINKS
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EXAMPLE
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Maximal 11 X 11 example:
0 0 0 1 1 0 1 1 0 0 0
0 0 0 0 1 0 1 0 0 0 0
0 0 0 0 1 0 1 0 0 0 0
1 0 0 0 1 0 1 0 0 0 1
1 1 1 1 0 0 0 1 1 1 1
0 0 0 0 0 0 0 0 0 0 0
1 1 1 1 0 0 0 1 1 1 1
1 0 0 0 1 0 1 0 0 0 1
0 0 0 0 1 0 1 0 0 0 0
0 0 0 0 1 0 1 0 0 0 0
0 0 0 1 1 0 1 1 0 0 0
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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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