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A146932 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1001-1111-1001 pattern in any orientation. 0
1, 1, 1, 1, 1, 5, 9, 21, 65, 198, 664, 2279, 9527, 44776, 245082, 1574117, 10939250, 91288331, 843940046 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,6
LINKS
EXAMPLE
Maximal 8 X 8 example
.1.1.1.0.1.0.0.1
.0.1.0.0.1.1.1.1
.0.1.0.0.1.0.0.1
.1.1.1.0.0.0.0.0
.0.0.0.0.0.1.1.1
.1.0.0.1.0.0.1.0
.1.1.1.1.0.0.1.0
.1.0.0.1.0.1.1.1
CROSSREFS
Sequence in context: A097074 A050559 A082676 * A146476 A110200 A063404
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified July 20 18:43 EDT 2024. Contains 374459 sequences. (Running on oeis4.)