A146734 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1110-0111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 65, 207, 775, 3377, 13307, 53409, 249201, 1453605, 9533963, 70032903, 523853865, 4420682653

Offset

1,8

Links

Table of n, a(n) for n=1..23.

Example

Maximal 8 X 8 example
.0.0.0.1.1.1.0.0
.0.0.1.1.1.0.0.0
.0.1.0.0.1.0.0.1
.1.1.0.0.0.1.1.1
.1.1.1.0.0.0.1.1
.1.0.0.1.0.0.1.0
.0.0.0.1.1.1.0.0
.0.0.1.1.1.0.0.0

Crossrefs

Sequence in context: A146710 A146803 A146702 * A146614 A146670 A146409

Adjacent sequences: A146731 A146732 A146733 * A146735 A146736 A146737

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved