A146581 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-1100-0111 pattern in any orientation.

1, 1, 1, 1, 3, 11, 31, 107, 597, 4235, 35993, 378513, 5151733, 87563339, 1913743005, 52850470565, 1858867426265, 81756583423405, 4581414733191763, 324047679491641949, 29188263592896961077

Offset

1,5

Links

Table of n, a(n) for n=1..21.

Example

Maximal 8 X 8 example
.0.0.0.1.1.1.0.0
.0.0.1.1.0.0.0.0
.0.1.0.1.0.0.0.0
.1.1.1.0.0.0.1.0
.1.0.0.0.0.1.1.1
.1.0.0.0.1.0.0.1
.0.0.0.1.1.0.0.1
.0.0.0.0.1.1.1.0

Crossrefs

Sequence in context: A263781 A119901 A106934 * A146456 A095692 A163421

Adjacent sequences: A146578 A146579 A146580 * A146582 A146583 A146584

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved