A146670 - OEIS

A146670

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0111-0110 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 71, 215, 791, 3245, 13621, 57411, 277797, 1527109, 9994857, 71286549, 571498723

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,8

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.0.0

.0.0.1.1.1.0.0.0

.0.1.0.1.1.0.0.1

.0.1.1.0.0.1.1.1

.1.1.1.0.0.1.1.0

.1.0.0.1.1.0.1.0

.0.0.0.1.1.1.0.0

.0.0.1.1.0.0.0.0

CROSSREFS

Sequence in context: A146702 A146734 A146614 * A146409 A147111 A146401

Adjacent sequences: A146667 A146668 A146669 * A146671 A146672 A146673

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved