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A146040 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all 1's connected only in a 2 X 4 tee 1,1 1,2 1,3 2,3 1,4 in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 29, 29, 249, 249, 4021, 4021, 99935, 99935, 4398251, 4398251, 362789159, 362789159, 47338031953, 47338031953, 10727733486159, 10727733486159 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,9
LINKS
EXAMPLE
Maximal 9 X 9 example
.1.0.0.1.0.1.0.0.1
.1.1.0.1.0.1.0.1.1
.1.0.1.1.0.1.1.0.1
.1.0.0.1.0.1.0.0.1
.0.0.0.0.0.0.0.0.0
.1.0.0.1.0.1.0.0.1
.1.0.1.1.0.1.1.0.1
.1.1.0.1.0.1.0.1.1
.1.0.0.1.0.1.0.0.1
CROSSREFS
Sequence in context: A146226 A146423 A146129 * A146017 A210267 A210309
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 26 2008
STATUS
approved

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Last modified March 28 14:21 EDT 2024. Contains 371254 sequences. (Running on oeis4.)