login
A146720
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111-1000 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 5, 17, 43, 65, 175, 507, 1901, 7015, 35249, 143079, 849399, 4342589, 31597665, 199056275, 1767268871
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.1.1.1.0.0.0.1.1
.1.1.0.0.1.1.1.1
.0.1.0.0.0.0.0.1
.0.1.0.0.0.0.0.0
.0.0.0.0.0.0.1.0
.1.0.0.0.0.0.1.0
.1.1.1.1.0.0.1.1
.1.1.0.0.0.1.1.1
CROSSREFS
Sequence in context: A055609 A231703 A265193 * A146640 A100705 A100662
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved