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A147057
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-1101-0111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 3, 15, 43, 67, 135, 405, 1643, 5861, 31427, 120095, 674029, 3441725, 24151139, 153308175, 1325530085
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.1.0.0.1.1.0
.1.0.1.1.0.1.0.0
.1.1.1.0.0.1.1.1
.0.0.0.0.0.0.1.0
.0.1.0.0.0.0.0.0
.1.1.1.0.0.1.1.1
.0.0.1.0.1.1.0.1
.0.1.1.0.0.1.0.0
CROSSREFS
Sequence in context: A192060 A316642 A146805 * A330322 A101165 A127407
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved