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A146277 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 110-111-111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 3, 5, 5, 9, 9, 21, 21, 93, 93, 381, 381, 1551, 1551, 7459, 7459, 56347, 56347, 473995, 473995, 4321181 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,7
LINKS
EXAMPLE
Maximal 8 X 8 example
.1.1.1.0.0.1.1.1
.1.1.1.0.0.1.1.1
.1.1.0.0.0.0.1.1
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.1.1.0.0.0.0.1.1
.1.1.1.0.0.1.1.1
.1.1.1.0.0.1.1.1
CROSSREFS
Sequence in context: A146914 A146253 A147040 * A050822 A187494 A283843
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified June 16 16:46 EDT 2024. Contains 373432 sequences. (Running on oeis4.)