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A146186 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-100 pattern in any orientation. 0
1, 1, 1, 1, 1, 3, 17, 39, 67, 157, 683, 2593, 13101, 70047, 421791, 2622253, 19003451, 153761107, 1499143675, 15781975001, 199989123849, 2755107112873 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,6
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.1.0.0.0.1.1.0
.1.1.0.0.0.1.1.1
.1.1.1.0.0.1.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.1.0.0.1.1.1
.1.1.1.0.0.0.1.1
.0.1.1.0.0.0.1.0
CROSSREFS
Sequence in context: A097938 A354475 A073162 * A179783 A196781 A298232
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 27 2008
STATUS
approved

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Last modified April 24 06:14 EDT 2024. Contains 371918 sequences. (Running on oeis4.)