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Search: id:A147021
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| A147021 |
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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 01000-11111-01000 pattern in any orientation. |
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+0
1
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| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 33, 13, 357, 57, 3654, 277, 39873, 2427, 687008, 27961, 15511627, 440433, 608333563, 11044775, 33683651469, 365499077
(list; graph; listen)
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OFFSET
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1,11
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EXAMPLE
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Maximal 11 X 11 example
.0.0.0.1.0.0.0.1.0.0.0
.1.1.1.1.1.0.1.1.1.1.1
.0.0.0.1.0.0.0.1.0.0.0
.0.0.0.0.0.0.0.0.0.0.0
.0.0.0.1.0.0.0.1.0.0.0
.1.1.1.1.1.0.1.1.1.1.1
.0.0.0.1.0.0.0.1.0.0.0
.0.0.0.0.0.0.0.0.0.0.0
.0.0.0.1.0.0.0.1.0.0.0
.1.1.1.1.1.0.1.1.1.1.1
.0.0.0.1.0.0.0.1.0.0.0
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CROSSREFS
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Sequence in context: A113458 A120584 A123173 this_sequence A138839 A033353 A104781
Adjacent sequences: A147018 A147019 A147020 this_sequence A147022 A147023 A147024
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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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