login
A146423
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1010-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 29, 29, 229, 229, 1773, 1773, 39925, 39925, 1086663, 1086663, 55544427, 55544427, 4442151653, 4442151653
OFFSET
1,9
EXAMPLE
Maximal 9 X 9 example
.1.1.1.1.0.1.1.1.1
.1.0.1.0.0.0.1.0.1
.0.1.0.1.0.1.0.1.0
.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
.0.1.0.1.0.1.0.1.0
.1.0.1.0.0.0.1.0.1
.1.1.1.1.0.1.1.1.1
CROSSREFS
Sequence in context: A040813 A022363 A146226 * A146129 A146040 A146017
KEYWORD
nonn
AUTHOR
STATUS
approved