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Search: id:A147478
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| A147478 |
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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1111-1100 pattern in any orientation. |
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+0
1
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| 1, 1, 1, 1, 1, 1, 1, 1, 4, 7, 14, 21, 38, 89, 317, 871
(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
.0.0.0.0.1.1.0.0.0
.0.0.1.1.1.1.0.0.0
.0.1.0.0.1.1.0.0.0
.0.1.0.0.0.0.1.1.1
.1.1.1.0.0.0.1.1.1
.1.1.1.0.0.0.0.1.0
.0.0.0.1.1.0.0.1.0
.0.0.0.1.1.1.1.0.0
.0.0.0.1.1.0.0.0.0
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CROSSREFS
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Sequence in context: A161426 A115759 A157615 this_sequence A147372 A147440 A146678
Adjacent sequences: A147475 A147476 A147477 this_sequence A147479 A147480 A147481
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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)
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