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A146002
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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 3 X 3 "plus" shape (e.g., consisting of the points at the coordinates (2,1), (2,2), (2,3), (1,2), (3,2)).
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0
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1, 1, 2, 1, 2, 1, 5, 2, 9, 3, 28, 6, 76, 13, 295, 41, 1196, 134, 6337, 523, 36933, 2341, 266568, 13112, 2186885, 85330, 21909179, 657274, 253725200, 5867785
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OFFSET
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1,3
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LINKS
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EXAMPLE
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Maximal 8 X 8 example:
0 1 0 0 0 0 1 0
1 1 1 0 0 1 1 1
0 1 0 0 0 0 1 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 1 0 0 0 0 1 0
1 1 1 0 0 1 1 1
0 1 0 0 0 0 1 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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