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Search: id:A147048
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| A147048 |
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Number of n X n binary arrays symmetric about the diagonal and 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, 3, 3, 5, 5, 13, 13, 29, 29, 101, 101, 469, 469, 2569, 2569, 14457, 14457, 96029, 96029, 884501, 884501, 9747473
(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
.0.0.1.0.0.0.1.0.0
.0.0.1.1.0.1.1.0.0
.1.1.1.0.0.0.1.1.1
.0.1.0.0.0.0.0.1.0
.0.0.0.0.0.0.0.0.0
.0.1.0.0.0.0.0.1.0
.1.1.1.0.0.0.1.1.1
.0.0.1.1.0.1.1.0.0
.0.0.1.0.0.0.1.0.0
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CROSSREFS
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Sequence in context: A161220 A032022 A147198 this_sequence A110192 A014414 A087745
Adjacent sequences: A147045 A147046 A147047 this_sequence A147049 A147050 A147051
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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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