A147219 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0101 pattern in any orientation.

1, 1, 1, 1, 1, 5, 17, 37, 107, 651, 4763, 31885, 243507, 2726593, 39573223, 647861719, 12294997893, 299566536047, 9265546813073, 344823799726629

Offset

1,6

Links

Table of n, a(n) for n=1..20.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.1.0.1.0
.0.0.0.0.1.1.1.0
.0.0.1.1.0.0.1.1
.0.0.0.1.0.0.0.0
.0.0.1.1.1.0.0.0
.0.0.0.0.1.0.0.0

Crossrefs

Sequence in context: A121326 A347300 A212876 * A146280 A282511 A147181

Adjacent sequences: A147216 A147217 A147218 * A147220 A147221 A147222

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved