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Search: id:A147220
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| A147220 |
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0111-0101 pattern in any orientation. |
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+0
1
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| 1, 1, 1, 1, 1, 1, 1, 1, 5, 13, 25, 43, 115
(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
.0.0.0.0.1.0.1.0.0
.0.0.0.0.1.1.1.0.0
.0.0.0.1.1.0.0.1.1
.0.0.1.0.0.0.0.1.0
.1.1.1.0.0.0.1.1.1
.0.1.0.0.0.0.1.0.0
.1.1.0.0.1.1.0.0.0
.0.0.1.1.1.0.0.0.0
.0.0.1.0.1.0.0.0.0
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CROSSREFS
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Sequence in context: A064276 A102724 A147031 this_sequence A147182 A146175 A146851
Adjacent sequences: A147217 A147218 A147219 this_sequence A147221 A147222 A147223
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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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