login
A147425
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 10101-11111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 3, 5, 9, 15, 25, 39, 112, 309, 909, 2627, 8069, 23067, 88292, 336847, 1557719, 7093487, 36776203
OFFSET
1,9
EXAMPLE
Maximal 9 X 9 example
.0.0.1.0.1.0.1.0.0
.0.0.1.1.1.1.1.0.0
.1.1.0.0.0.0.0.1.1
.0.1.0.0.0.0.0.1.0
.1.1.0.0.0.0.0.1.1
.0.1.0.0.0.0.0.1.0
.1.1.0.0.0.0.0.1.1
.0.0.1.1.1.1.1.0.0
.0.0.1.0.1.0.1.0.0
CROSSREFS
Sequence in context: A135342 A029877 A207641 * A080430 A053523 A053522
KEYWORD
nonn
AUTHOR
STATUS
approved