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A146143
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Number of n X n binary arrays symmetric under 180 degree rotation 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, 13, 51, 327, 1743, 13905, 216443, 3286293, 80038799, 2242888197, 93345565591, 4572631279405, 334861611729305
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OFFSET
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1,5
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LINKS
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EXAMPLE
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Maximal 8 X 8 example
.0.1.1.0.0.0.1.0
.1.1.0.0.0.1.1.1
.0.1.0.0.1.0.0.1
.0.0.1.0.1.1.1.0
.0.1.1.1.0.1.0.0
.1.0.0.1.0.0.1.0
.1.1.1.0.0.0.1.1
.0.1.0.0.0.1.1.0
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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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