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A146141
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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 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, 1, 1, 1, 1, 7, 7, 21, 21, 61, 61, 403, 403, 3415, 3415, 36395, 36395, 473261, 473261, 8291363, 8291363, 204964495, 204964495
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,11
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EXAMPLE
| Maximal 11 X 11 example
.0.0.0.1.0.0.0.1.0.0.0
.0.0.1.1.0.0.0.1.1.0.0
.0.1.0.1.1.0.1.1.0.1.0
.1.1.1.0.0.0.0.0.1.1.1
.0.0.1.0.0.0.0.0.1.0.0
.0.0.0.0.0.0.0.0.0.0.0
.0.0.1.0.0.0.0.0.1.0.0
.1.1.1.0.0.0.0.0.1.1.1
.0.1.0.1.1.0.1.1.0.1.0
.0.0.1.1.0.0.0.1.1.0.0
.0.0.0.1.0.0.0.1.0.0.0
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CROSSREFS
| Sequence in context: A146402 A146410 A146466 * A062368 A059772 A114369
Adjacent sequences: A146138 A146139 A146140 * A146142 A146143 A146144
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KEYWORD
| nonn
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net), Oct 27 2008
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