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A146261 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 110-111-101 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 13, 13, 31, 31, 77, 77, 447, 447, 3609, 3609, 25623 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,11
LINKS
EXAMPLE
Maximal 11 X 11 example
.0.0.1.0.1.0.1.0.1.0.0
.0.0.1.1.1.0.1.1.1.0.0
.1.1.0.1.1.0.1.1.0.1.1
.0.1.1.0.0.0.0.0.1.1.0
.1.1.1.0.0.0.0.0.1.1.1
.0.0.0.0.0.0.0.0.0.0.0
.1.1.1.0.0.0.0.0.1.1.1
.0.1.1.0.0.0.0.0.1.1.0
.1.1.0.1.1.0.1.1.0.1.1
.0.0.1.1.1.0.1.1.1.0.0
.0.0.1.0.1.0.1.0.1.0.0
CROSSREFS
Sequence in context: A168234 A141245 A147032 * A146176 A147136 A146844
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified April 13 22:20 EDT 2024. Contains 371646 sequences. (Running on oeis4.)