A146654 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0100-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 3, 7, 15, 33, 67, 183, 469, 1433, 5417, 21723, 100185, 477751, 2441485, 14323245, 87372485

Offset

1,8

Links

Table of n, a(n) for n=1..22.

Example

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

Crossrefs

Sequence in context: A365527 A079444 A269560 * A363503 A193641 A026701

Adjacent sequences: A146651 A146652 A146653 * A146655 A146656 A146657

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved