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A146844 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1001-1111-1000 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 13, 13, 31, 31, 85, 85, 391, 391 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,13
LINKS
EXAMPLE
Maximal 13 X 13 example
.0.0.1.0.0.1.0.1.0.0.1.0.0
.0.0.1.1.1.1.0.1.1.1.1.0.0
.1.1.0.0.0.1.0.1.0.0.0.1.1
.0.1.0.0.0.0.0.0.0.0.0.1.0
.0.1.0.0.0.0.0.0.0.0.0.1.0
.1.1.1.0.0.0.0.0.0.0.1.1.1
.0.0.0.0.0.0.0.0.0.0.0.0.0
.1.1.1.0.0.0.0.0.0.0.1.1.1
.0.1.0.0.0.0.0.0.0.0.0.1.0
.0.1.0.0.0.0.0.0.0.0.0.1.0
.1.1.0.0.0.1.0.1.0.0.0.1.1
.0.0.1.1.1.1.0.1.1.1.1.0.0
.0.0.1.0.0.1.0.1.0.0.1.0.0
CROSSREFS
Sequence in context: A146261 A146176 A147136 * A146193 A146727 A146426
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
EXTENSIONS
Repaired example. - R. H. Hardin, Nov 05 2008
STATUS
approved

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Last modified April 24 14:54 EDT 2024. Contains 371960 sequences. (Running on oeis4.)