login
A146222
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 101-111-010 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 8, 19, 32, 59, 168, 529, 2001, 7331, 32274, 148084, 749186, 4153139, 26410348, 177997054, 1409667475, 11785334777, 115210607000, 1184859282420, 13940662127003
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.0.1.0
.1.1.0.0.1.1.1.0
.0.1.1.0.0.1.0.0
.1.1.0.0.0.0.0.0
.0.0.0.0.0.0.1.1
.0.0.1.0.0.1.1.0
.0.1.1.1.0.0.1.1
.0.1.0.1.0.0.0.0
CROSSREFS
Sequence in context: A144171 A017485 A146270 * A140672 A230098 A262713
KEYWORD
nonn
AUTHOR
STATUS
approved