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Search: id:A147199
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| A147199 |
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0100-0111-0001 pattern in any orientation. |
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+0
1
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| 1, 1, 1, 1, 1, 1, 1, 1, 9, 25, 37, 77, 207, 663, 1517, 4967, 16733, 80643, 308521, 1536069, 6622503, 39983439, 198749745, 1357116341
(list; graph; listen)
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OFFSET
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1,9
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EXAMPLE
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Maximal 9 X 9 example
.0.0.0.1.0.1.0.0.0
.0.1.1.1.0.1.1.1.0
.0.1.0.0.0.0.0.1.0
.1.1.0.0.0.0.0.1.1
.0.0.0.0.0.0.0.0.0
.1.1.0.0.0.0.0.1.1
.0.1.0.0.0.0.0.1.0
.0.1.1.1.0.1.1.1.0
.0.0.0.1.0.1.0.0.0
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CROSSREFS
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Sequence in context: A090333 A137190 A044070 this_sequence A147403 A044451 A114057
Adjacent sequences: A147196 A147197 A147198 this_sequence A147200 A147201 A147202
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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), Nov 04 2008
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