login
A147408
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1001-1001-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 5, 13, 25, 49, 175, 865, 4191, 18461, 94551, 650857, 5436423, 49032533, 472638523, 5306220921, 72329183333, 1150334935553, 20498079126697, 410408073960755
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.1.0.0.1
.0.0.0.0.1.0.0.1
.0.0.0.0.1.1.1.1
.0.1.1.1.0.0.0.0
.0.0.0.1.0.0.0.0
.0.0.0.1.0.0.0.0
.0.1.1.1.0.0.0.0
CROSSREFS
Sequence in context: A272705 A147272 A147427 * A241657 A249513 A147090
KEYWORD
nonn
AUTHOR
STATUS
approved