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A146380 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0100-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 13, 27, 135, 527, 2581, 17899, 176183, 1596080, 23232289, 321756402, 6986541337, 150961652645, 4812704574943, 154830665386988 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,6
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.1.0.0
.0.0.0.0.1.1.1.1
.0.1.0.0.0.1.0.0
.1.1.1.1.0.0.1.0
.0.1.0.0.1.1.1.1
.0.0.1.0.0.0.1.0
.1.1.1.1.0.0.0.0
.0.0.1.0.0.0.0.0
CROSSREFS
Sequence in context: A098266 A041332 A041334 * A146372 A018946 A042397
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified April 22 20:16 EDT 2024. Contains 371906 sequences. (Running on oeis4.)