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A147256
Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0001-1101-0111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 17, 21, 549, 1079, 10673, 26871, 476485, 1364599, 88490477, 316329117, 38154154091, 169142706059, 28100677201207, 150981261883543, 38976852011544623
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
.1.1.1.0.0.1.1.1
.0.0.1.0.0.1.0.0
.0.1.1.0.0.1.1.0
.0.1.0.0.0.0.1.0
CROSSREFS
Sequence in context: A147132 A146840 A146587 * A147163 A147179 A146627
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved