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A147243
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1101-0111-0010 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 3, 5, 11, 21, 39, 109, 383, 1291, 5187, 19147, 85163, 418695, 2523925, 15886439, 116954773, 866328129
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.1.1.0.1.0.0.0
.1.0.1.1.1.0.0.0
.1.1.0.1.0.0.0.0
.0.1.1.0.0.0.1.1
.1.1.0.0.0.1.1.0
.0.0.0.0.1.0.1.1
.0.0.0.1.1.1.0.1
.0.0.0.1.0.1.1.0
CROSSREFS
Sequence in context: A293317 A230097 A146787 * A372451 A192664 A122997
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved