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Search: id:A147049
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| A147049 |
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-1100-0111-0010 pattern in any orientation. |
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+0
1
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| 1, 1, 1, 1, 1, 1, 1, 1, 21, 25, 57, 73, 453, 801, 5305, 11153, 83189
(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
.0.0.0.0.0.1.0.0.0
.0.0.0.0.0.1.1.0.0
.0.1.0.1.1.1.0.0.0
.1.1.1.0.1.0.1.0.0
.0.0.1.1.0.1.1.0.0
.0.0.1.0.1.0.1.1.1
.0.0.0.1.1.1.0.1.0
.0.0.1.1.0.0.0.0.0
.0.0.0.1.0.0.0.0.0
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CROSSREFS
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Sequence in context: A141734 A118578 A118568 this_sequence A020269 A035700 A134935
Adjacent sequences: A147046 A147047 A147048 this_sequence A147050 A147051 A147052
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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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