A147204 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0101-0111 pattern in any orientation.

1, 1, 1, 1, 1, 5, 17, 37, 97, 589, 4299, 27851, 193127, 2080835, 29286959, 452848509, 7844143081, 177658806371, 5163186936815, 177926288939305

Offset

1,6

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.1.1.1.0
.0.0.0.0.1.0.1.0
.0.0.0.1.1.0.0.0
.0.0.1.0.0.0.0.0
.1.1.1.0.0.0.0.0
.1.0.0.0.0.0.0.0
.1.1.0.0.0.0.0.0
.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A146874 A145012 A360204 * A168024 A121326 A347300

Adjacent sequences: A147201 A147202 A147203 * A147205 A147206 A147207

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved