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A146045
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 2X4 tee 1,1 1,2 1,3 2,3 1,4 in any orientation.
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0
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1, 1, 1, 5, 17, 49, 267, 1635, 15439, 178481, 2706563, 52897007, 1344799359, 42695435337, 1933850526571, 106233098774339
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OFFSET
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1,4
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.0.0.0.0.1.1.1.1
.0.1.0.0.0.1.0.0
.1.1.1.1.0.0.1.0
.0.0.0.0.1.1.1.1
.1.1.1.1.0.0.0.0
.0.1.0.0.1.1.1.1
.0.0.1.0.0.0.1.0
.1.1.1.1.0.0.0.0
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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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