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A147042 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0100-0100-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 3, 13, 39, 151, 607, 2057, 13855, 94157, 812183, 7313331, 95388939, 1173110437 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,6
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.1.0.0.0.1.0.0
.1.1.1.1.0.1.0.0
.0.1.0.0.1.1.1.1
.0.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.0
.1.1.1.1.0.0.1.0
.0.0.1.0.1.1.1.1
.0.0.1.0.0.0.1.0
CROSSREFS
Sequence in context: A103277 A166897 A167910 * A018492 A227446 A059020
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified May 26 20:04 EDT 2024. Contains 372844 sequences. (Running on oeis4.)