login
A146685
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1000-1111 pattern in any orientation.
0
1, 1, 1, 1, 3, 7, 19, 43, 167, 933, 5533, 35651, 275619, 2803985, 35280241, 511587387, 8841277573, 187861018789, 4919632132323, 154644209783001
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.1.1.1.0
.0.0.0.1.0.0.0.0
.0.0.0.1.1.0.0.0
.1.1.1.0.0.1.1.1
.1.0.1.0.0.1.0.1
.1.0.0.1.1.0.0.1
.1.0.0.1.0.0.0.1
.0.0.0.1.1.1.1.0
CROSSREFS
Sequence in context: A176500 A334099 A136041 * A146653 A096447 A274596
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved