login
A146378
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0100-1111-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 5, 1, 16, 5, 66, 13, 195, 31, 1006, 121, 6245, 491, 48466, 3357, 493217, 25639, 5217946, 206564, 68677904, 2153667
OFFSET
1,9
EXAMPLE
Maximal 9 X 9 example
.0.0.0.0.1.0.0.0.0
.0.0.0.0.1.0.0.0.0
.0.0.0.1.1.1.0.0.0
.0.0.1.0.1.0.1.0.0
.1.1.1.1.0.1.1.1.1
.0.0.1.0.1.0.1.0.0
.0.0.0.1.1.1.0.0.0
.0.0.0.0.1.0.0.0.0
.0.0.0.0.1.0.0.0.0
CROSSREFS
Sequence in context: A289310 A160085 A147024 * A166086 A232101 A176249
KEYWORD
nonn
AUTHOR
STATUS
approved