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A146474
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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 1110-0111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 9, 9, 23, 23, 85, 85, 375, 375, 2149, 2149, 15299, 15299, 129877, 129877, 1353943, 1353943, 17475557, 17475557
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,11
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EXAMPLE
| Maximal 11 X 11 example
.0.0.0.1.0.0.0.1.0.0.0
.0.0.0.1.1.0.1.1.0.0.0
.0.0.0.1.1.0.1.1.0.0.0
.1.1.1.0.1.0.1.0.1.1.1
.0.1.1.1.0.0.0.1.1.1.0
.0.0.0.0.0.0.0.0.0.0.0
.0.1.1.1.0.0.0.1.1.1.0
.1.1.1.0.1.0.1.0.1.1.1
.0.0.0.1.1.0.1.1.0.0.0
.0.0.0.1.1.0.1.1.0.0.0
.0.0.0.1.0.0.0.1.0.0.0
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CROSSREFS
| Sequence in context: A146663 A146394 A147510 * A145957 A128019 A108411
Adjacent sequences: A146471 A146472 A146473 * A146475 A146476 A146477
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KEYWORD
| nonn
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net)
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