login
A146789
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-1100-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 9, 15, 43, 69, 163, 581, 2209, 8241, 41447, 165505, 1023967, 5358635, 39185391, 257135019, 2265291735
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.1.0.0.0.1.1.1.1
.1.0.0.0.1.1.0.0
.1.1.1.0.0.1.0.0
.1.1.0.0.0.0.0.0
.0.0.0.0.0.0.1.1
.0.0.1.0.0.1.1.1
.0.0.1.1.0.0.0.1
.1.1.1.1.0.0.0.1
CROSSREFS
Sequence in context: A128687 A193579 A274757 * A194946 A020172 A020174
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved