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A146784
Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0100-1100-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 19, 31, 615, 1219, 16139, 42305, 1128827, 3502811, 254593369, 985218883, 138612115423, 664622922147, 144116871368241, 849726636226171, 336332191825755637
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.1.1.0.0.0.0.1.1
.1.1.1.0.0.1.1.1
.1.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.1
.0.0.1.0.0.1.0.0
.0.0.1.0.0.1.0.0
.1.1.1.0.0.1.1.1
.0.1.1.0.0.1.1.0
CROSSREFS
Sequence in context: A139847 A087764 A146691 * A147240 A147210 A146816
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved