login
A146173
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 110-100-111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 9, 9, 33, 33, 89, 89, 853, 853, 34557, 34557, 906369, 906369, 18920177, 18920177, 1254520087, 1254520087, 193995577775, 193995577775
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.1.0.0.0.0.0.0.1
.1.0.1.0.0.1.0.1
.1.1.1.0.0.1.1.1
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.1.1.1.0.0.1.1.1
.1.0.1.0.0.1.0.1
.1.0.0.0.0.0.0.1
CROSSREFS
Sequence in context: A146825 A147029 A146258 * A146190 A147125 A147109
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 27 2008
STATUS
approved