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A146259 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 110-111-101 pattern in any orientation. 0
1, 1, 1, 1, 3, 13, 31, 77, 447, 3609, 25623, 200309, 2271887, 36004709, 643384137, 13404301669, 367224822485, 12922817223889, 545705442791831, 28082761867376669, 1838300090661189305 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,5
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.1.1.1.0.0.0
.0.0.1.1.0.0.0.0
.1.1.0.1.1.0.0.0
.1.1.1.0.0.1.0.1
.1.0.1.0.0.1.1.1
.0.0.0.1.1.0.1.1
.0.0.0.0.1.1.0.0
.0.0.0.1.1.1.0.0
CROSSREFS
Sequence in context: A164569 A007686 A147030 * A146174 A147134 A146842
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified April 21 17:00 EDT 2024. Contains 371874 sequences. (Running on oeis4.)