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A146999
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 00100-00100-11111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 2, 3, 5, 7, 13, 19, 53, 121, 389, 940, 3064, 7695, 29728, 97515, 493327, 1920641, 10778992, 46183271, 290012194, 1476840183, 11445253811
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.1.1.1.1.1.0
.0.0.0.0.1.0.0.1
.1.0.0.0.1.0.0.1
.1.0.0.0.0.1.1.1
.1.1.1.0.0.0.0.1
.1.0.0.1.0.0.0.1
.1.0.0.1.0.0.0.0
.0.1.1.1.1.1.0.0
CROSSREFS
Sequence in context: A108310 A252398 A330383 * A147485 A341650 A341640
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved