A146614 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-0110 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 71, 211, 797, 3273, 14255, 57311, 279147, 1519281, 10176213, 72296847, 593664689

Offset

1,8

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.0.1.0.0
.0.0.1.1.1.1.0.0
.0.1.0.1.1.0.1.1
.0.1.1.0.0.1.1.0
.0.1.1.0.0.1.1.0
.1.1.0.1.1.0.1.0
.0.0.1.1.1.1.0.0
.0.0.1.0.0.0.0.0

Crossrefs

Sequence in context: A146803 A146702 A146734 * A146670 A146409 A147111

Adjacent sequences: A146611 A146612 A146613 * A146615 A146616 A146617

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved