A147158 - OEIS

A147158

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1100-0111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 35, 85

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

OFFSET

1,9

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.1.1.0.0

.0.0.0.1.1.1.0.0.0

.0.0.0.0.1.0.0.0.1

.0.1.0.0.1.0.0.1.1

.0.1.1.1.0.1.1.1.0

.1.1.0.0.1.0.0.1.0

.1.0.0.0.1.0.0.0.0

.0.0.0.1.1.1.0.0.0

.0.0.1.1.0.0.0.0.0

CROSSREFS

Sequence in context: A062748 A325666 A147174 * A014540 A293058 A294367

Adjacent sequences: A147155 A147156 A147157 * A147159 A147160 A147161

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved