login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A147510
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 11110-01111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 9, 9, 23, 23, 81, 81, 267, 267, 1053, 1053, 6173, 6173
OFFSET
1,13
EXAMPLE
Maximal 13 X 13 example
.0.0.0.0.1.0.0.0.1.0.0.0.0
.0.0.0.0.1.1.0.1.1.0.0.0.0
.0.0.0.0.1.1.0.1.1.0.0.0.0
.0.0.0.0.1.1.0.1.1.0.0.0.0
.1.1.1.1.0.1.0.1.0.1.1.1.1
.0.1.1.1.1.0.0.0.1.1.1.1.0
.0.0.0.0.0.0.0.0.0.0.0.0.0
.0.1.1.1.1.0.0.0.1.1.1.1.0
.1.1.1.1.0.1.0.1.0.1.1.1.1
.0.0.0.0.1.1.0.1.1.0.0.0.0
.0.0.0.0.1.1.0.1.1.0.0.0.0
.0.0.0.0.1.1.0.1.1.0.0.0.0
.0.0.0.0.1.0.0.0.1.0.0.0.0
CROSSREFS
Sequence in context: A146820 A146663 A146394 * A146474 A145957 A214439
KEYWORD
nonn
AUTHOR
STATUS
approved