A146777 - OEIS

A146777

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0010-1010-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 49, 49, 205, 205, 3001, 3001, 66003, 66003, 1489297, 1489297, 39955495, 39955495

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

OFFSET

1,9

LINKS

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

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.0.1.0

.0.1.0.1.0.1.0.1.0

.1.1.1.1.0.1.1.1.1

.0.0.0.0.0.0.0.0.0

.1.1.1.1.0.1.1.1.1

.0.1.0.1.0.1.0.1.0

.0.1.0.0.0.0.0.1.0

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A146793 A146801 A147203 * A147053 A146857 A146668

Adjacent sequences: A146774 A146775 A146776 * A146778 A146779 A146780

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved