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A147403
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 9, 25, 37, 81, 207, 659, 1525, 5011, 16955, 78955, 307577, 1539617, 6559267, 39653567, 197073411, 1351045655
OFFSET
1,9
EXAMPLE
Maximal 9 X 9 example
.0.0.0.0.1.1.0.0.0
.0.0.0.1.0.1.1.0.0
.0.1.1.1.0.1.1.0.0
.1.1.1.0.0.0.1.1.0
.1.0.0.0.0.0.0.0.1
.0.1.1.0.0.0.1.1.1
.0.0.1.1.0.1.1.1.0
.0.0.1.1.0.1.0.0.0
.0.0.0.1.1.0.0.0.0
CROSSREFS
Sequence in context: A348234 A226647 A147199 * A241764 A044451 A114057
KEYWORD
nonn
AUTHOR
STATUS
approved