A146710 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 61, 193, 825, 3483, 14075, 51829, 241741, 1419559, 10170199, 74039549, 568610375, 4513545321

Offset

1,8

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.1.1.0.0
.0.0.1.1.1.1.0.0
.0.1.0.0.1.0.1.1
.0.1.0.0.0.1.1.1
.1.1.1.0.0.0.1.0
.1.1.0.1.0.0.1.0
.0.0.1.1.1.1.0.0
.0.0.1.1.0.0.0.0

Crossrefs

Sequence in context: A147135 A146843 A146630 * A146803 A146702 A146734

Adjacent sequences: A146707 A146708 A146709 * A146711 A146712 A146713

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved