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A145999 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 3X3 plus 2,1 2,2 2,3 1,2 3,2. 0
1, 1, 2, 1, 2, 1, 7, 2, 23, 5, 132, 12, 836, 51, 8563, 317, 115954, 2654, 2274857, 30351, 60964251, 489559, 2304941344, 11104536, 120886008663, 350752586, 8909697213591, 15493779226, 915528841065256, 954798521885 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1
.0.1.0.0.0.0.1.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1
.0.1.0.0.0.0.1.0
CROSSREFS
Sequence in context: A046749 A016543 A300585 * A198316 A011128 A245595
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 26 2008
STATUS
approved

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Last modified June 28 10:31 EDT 2024. Contains 373782 sequences. (Running on oeis4.)