A146653 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0100-1111 pattern in any orientation.

1, 1, 1, 1, 3, 7, 19, 43, 173, 1027, 6241, 39873, 317065, 3440337, 46130903, 694355761, 12449375951, 281232131103, 7909400224367, 265990951612641

Offset

1,5

Links

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

Example

Maximal 8 X 8 example
.0.1.1.1.1.0.0.0
.1.0.0.1.0.0.0.0
.1.0.0.1.1.0.0.0
.1.1.1.0.0.1.0.1
.1.0.1.0.0.1.1.1
.0.0.0.1.1.0.0.1
.0.0.0.0.1.0.0.1
.0.0.0.1.1.1.1.0

Crossrefs

Sequence in context: A334099 A136041 A146685 * A096447 A274596 A374728

Adjacent sequences: A146650 A146651 A146652 * A146654 A146655 A146656

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved