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A146848
Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-1111-0001 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 17, 21, 589, 1209, 14169, 35833, 752335, 2255937, 153849079, 571403355, 75555523219, 350876915239, 81358170973501, 466475370757593, 166717546455270435, 1170203411896641439
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.1.1.0.0.1.1.0
.0.1.0.0.0.0.1.0
.1.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.1
CROSSREFS
Sequence in context: A146707 A146643 A146715 * A146611 A146398 A146406
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved