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A146032 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 3X3 el 1,1 1,2 1,3 2,3 3,3 in any orientation. 0
1, 1, 1, 1, 1, 1, 5, 5, 19, 19, 79, 79, 523, 523, 9169, 9169, 183491, 183491, 4964583, 4964583, 219022025, 219022025, 16321424419, 16321424419, 1718337883769, 1718337883769, 267799571260427, 267799571260427 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,7
LINKS
EXAMPLE
Maximal 8 X 8 example
.1.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.1
.1.1.1.0.0.1.1.1
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.1.1.1.0.0.1.1.1
.1.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.1
CROSSREFS
Sequence in context: A255454 A255443 A205108 * A147093 A147101 A147141
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 26 2008
STATUS
approved

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Last modified March 29 06:15 EDT 2024. Contains 371265 sequences. (Running on oeis4.)