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A146723
Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1101-0111 pattern in any orientation.
0
1, 1, 1, 1, 9, 13, 35, 63, 1723, 4113, 139447, 424285, 17547037, 65696265, 8305366965, 39548747551, 8986486324279, 53849970214263, 23104370746283843, 173734005704827315
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.1.1.0.0.0.0.1.1
.0.1.0.0.0.0.1.0
.1.1.0.0.0.0.1.1
.1.0.0.0.0.0.0.1
.0.0.1.0.0.1.0.0
.0.1.1.0.0.1.1.0
.0.1.0.0.0.0.1.0
.0.1.1.0.0.1.1.0
CROSSREFS
Sequence in context: A146864 A287766 A146739 * A146422 A147352 A147391
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved