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A146286 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 111-110-111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 5, 13, 29, 41, 99, 219, 653, 1719, 7125, 30115, 144385, 515791, 2502679, 10851481, 66672841, 362202203, 2693814149, 19415112859, 179313023913, 1385523385051 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,7
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.1.1.0
.1.0.1.0.1.1.0.0
.1.1.1.0.1.1.1.0
.1.1.1.0.0.0.0.0
.0.0.0.0.0.1.1.1
.0.1.1.1.0.1.1.1
.0.0.1.1.0.1.0.1
.0.1.1.1.0.0.0.0
CROSSREFS
Sequence in context: A159351 A163251 A247177 * A065374 A130066 A206258
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified February 25 19:44 EST 2024. Contains 370332 sequences. (Running on oeis4.)