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A147235
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1101-0111-0001 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 3, 7, 15, 31, 65, 185, 517, 1673, 6585, 26113, 126591, 608081, 3381041, 20245821, 136182387
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.0.1.1.0
.0.0.0.1.1.1.0.1
.0.0.0.1.0.0.1.1
.1.1.1.0.0.0.1.0
.0.1.0.0.0.1.1.1
.1.1.0.0.1.0.0.0
.1.0.1.1.1.0.0.0
.0.1.1.0.1.0.0.0
CROSSREFS
Sequence in context: A365530 A351707 A146811 * A024876 A146598 A147094
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved