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A146138
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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 5-point barb 1,1 1,2 2,2 2,3 3,2 in any orientation.
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0
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1, 1, 1, 1, 1, 1, 9, 9, 33, 33, 153, 153, 3123, 3123, 118071, 118071, 4682615, 4682615, 398324801, 398324801, 67438703311, 67438703311, 18607359075661, 18607359075661, 8942742118054707
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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
.0.1.0.0.0.0.1.0
.0.1.1.0.0.1.1.0
.1.1.0.0.0.0.1.1
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.1.1.0.0.0.0.1.1
.0.1.1.0.0.1.1.0
.0.1.0.0.0.0.1.0
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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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