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A146604
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1111-0001 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 29, 29, 137, 137, 1079, 1079, 13093, 13093, 250867, 250867, 6233403, 6233403, 218750525, 218750525, 11495073517, 11495073517, 872282781415
OFFSET
1,9
EXAMPLE
Maximal 9 X 9 example
.0.0.0.0.0.0.0.0.0
.1.0.0.0.0.0.0.0.1
.1.1.1.1.0.1.1.1.1
.0.0.0.1.0.1.0.0.0
.0.0.0.0.0.0.0.0.0
.0.0.0.1.0.1.0.0.0
.1.1.1.1.0.1.1.1.1
.1.0.0.0.0.0.0.0.1
.0.0.0.0.0.0.0.0.0
CROSSREFS
Sequence in context: A076089 A046000 A147378 * A294691 A356839 A147172
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved