login
A146598
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1000-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 3, 7, 15, 31, 71, 203, 581, 2061, 8089, 33693, 163089, 819567, 4807311, 30022515, 215155907, 1673895429
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.1.1.1.0
.0.0.0.1.0.0.0.1
.0.0.0.1.0.0.0.1
.1.1.1.0.0.0.0.1
.1.0.0.0.0.1.1.1
.1.0.0.0.1.0.0.0
.1.0.0.0.1.0.0.0
.0.1.1.1.1.0.0.0
CROSSREFS
Sequence in context: A146811 A147235 A024876 * A147094 A326518 A147285
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved