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A147020
Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 01000-11111-01000 pattern in any orientation.
0
1, 1, 1, 1, 3, 1, 15, 9, 133, 33, 3625, 1063, 187163, 37071, 15421524, 1848587, 2304715815, 239808955, 763574051396, 59268926793, 494418074953389, 27771432799839
OFFSET
1,5
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
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1
.0.1.0.0.0.0.1.0
CROSSREFS
Sequence in context: A318392 A329059 A147453 * A134685 A130757 A181996
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved