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Search: id:A146141
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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
1
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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; listen)
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OFFSET
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1,11
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EXAMPLE
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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
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Sequence in context: A146402 A146410 A146466 this_sequence A062368 A059772 A114369
Adjacent sequences: A146138 A146139 A146140 this_sequence A146142 A146143 A146144
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhhardin(AT)att.net), Oct 27 2008
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