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Search: id:A146875
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| A146875 |
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1110-0100-0111 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, 41, 109, 333, 897, 2841, 13365, 66133, 320121, 1501457, 8213389, 51555309
(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
.0.0.0.0.1.1.1.0.0
.0.0.0.0.0.1.0.0.0
.0.0.0.1.1.1.0.0.1
.0.0.1.0.0.0.1.1.1
.1.0.1.0.0.0.1.0.1
.1.1.1.0.0.0.1.0.0
.1.0.0.1.1.1.0.0.0
.0.0.0.1.0.0.0.0.0
.0.0.1.1.1.0.0.0.0
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CROSSREFS
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Sequence in context: A146590 A098483 A147205 this_sequence A064276 A102724 A147031
Adjacent sequences: A146872 A146873 A146874 this_sequence A146876 A146877 A146878
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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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