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Search: id:A147151
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| A147151 |
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1100-0111-0010 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, 61, 195, 561, 1503, 6349, 34075, 171101, 895779, 5615365, 39425317, 281937999
(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
.0.0.0.0.0.0.1.0.0
.0.0.0.0.0.1.1.0.0
.0.0.0.1.1.1.0.1.1
.0.0.1.0.1.0.1.1.0
.0.0.1.1.0.1.1.0.0
.0.1.1.0.1.0.1.0.0
.1.1.0.1.1.1.0.0.0
.0.0.1.1.0.0.0.0.0
.0.0.1.0.0.0.0.0.0
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CROSSREFS
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Sequence in context: A146283 A026373 A066885 this_sequence A057288 A107466 A098480
Adjacent sequences: A147148 A147149 A147150 this_sequence A147152 A147153 A147154
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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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