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A146253 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 110-111-011 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 3, 5, 5, 9, 9, 19, 19, 71, 71, 265, 265, 1031, 1031, 4533, 4533, 26975, 26975, 188011, 188011, 1487007, 1487007, 13567107, 13567107 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,7
LINKS
EXAMPLE
Maximal 8 X 8 example
.1.1.0.0.0.0.1.1
.1.1.1.0.0.1.1.1
.0.1.1.0.0.1.1.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.1.1.0.0.1.1.0
.1.1.1.0.0.1.1.1
.1.1.0.0.0.0.1.1
CROSSREFS
Sequence in context: A049644 A147472 A146914 * A147040 A146277 A050822
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified June 21 07:08 EDT 2024. Contains 373540 sequences. (Running on oeis4.)