login
A147093
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1000-1000-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 19, 19, 87, 87, 337, 337, 1993, 1993, 25339, 25339, 376795, 376795, 8378039, 8378039, 203827787, 203827787
OFFSET
1,9
EXAMPLE
Maximal 9 X 9 example
.0.0.0.1.0.1.0.0.0
.0.0.0.1.0.1.0.0.0
.0.0.0.1.0.1.0.0.0
.1.1.1.1.0.1.1.1.1
.0.0.0.0.0.0.0.0.0
.1.1.1.1.0.1.1.1.1
.0.0.0.1.0.1.0.0.0
.0.0.0.1.0.1.0.0.0
.0.0.0.1.0.1.0.0.0
CROSSREFS
Sequence in context: A255443 A205108 A146032 * A147101 A147141 A146146
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved