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A146010
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 3X3 tee 1,1 1,2 1,3 2,2 3,2 in any orientation.
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0
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1, 1, 1, 1, 1, 1, 2, 5, 10, 17, 41, 113, 371, 1287, 4551, 19076, 90597, 483533, 2906704, 18699832, 136658284, 1121369297, 10362476826, 106541327541, 1220122346197, 15486094270737, 222171208299640, 3540873297034591, 63467027877319177
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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
.0.0.0.1.0.0.0.0
.0.0.0.1.1.1.0.0
.0.0.0.1.0.0.1.0
.1.1.1.0.0.0.1.0
.0.1.0.0.0.1.1.1
.0.1.0.0.1.0.0.0
.0.0.1.1.1.0.0.0
.0.0.0.0.1.0.0.0
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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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