A146786 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-1100-1111 pattern in any orientation.

1, 1, 1, 1, 3, 9, 27, 85, 337, 1791, 13253, 115267, 1169733, 14374957, 216583105, 4102635811, 98419728413, 2904752917775, 103834255604223, 4525458320487677

Offset

1,5

Links

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

Example

Maximal 8 X 8 example
.0.0.0.1.1.0.0.0
.0.0.1.1.1.0.0.0
.0.1.0.0.1.0.0.0
.1.1.0.0.1.0.1.1
.1.1.1.1.0.1.1.1
.0.0.0.0.1.0.0.1
.0.0.0.1.1.0.0.1
.0.0.0.1.1.1.1.0

Crossrefs

Sequence in context: A351342 A308520 A176826 * A151029 A179263 A147242

Adjacent sequences: A146783 A146784 A146785 * A146787 A146788 A146789

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved