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A146030 Number of n X n binary arrays with all 1's connected only in a 3 X 3 el 1,1 1,2 1,3 2,3 3,3 in any orientation. 0
1, 1, 5, 19, 79, 523, 9169, 183491, 4964583, 219022025, 16321424419, 1718337883769, 267799571260427, 65285269375319479 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
EXAMPLE
Maximal 8 X 8 example
.1.1.1.0.0.1.1.1
.1.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.1
.0.0.1.1.1.0.0.0
.0.0.1.0.0.1.1.1
.1.0.1.0.1.0.0.1
.1.0.0.0.1.0.0.1
.1.1.1.0.1.1.1.0
CROSSREFS
Sequence in context: A149779 A125657 A111929 * A098041 A346817 A317131
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 26 2008
STATUS
approved

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Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)