A146911 - OEIS

A146911

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1110-0111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 9, 9, 21, 21, 85, 85, 553, 553, 5197, 5197, 59067, 59067, 895397, 895397, 19192871, 19192871, 570897325, 570897325, 23035046469, 23035046469

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

OFFSET

1,9

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

Maximal 9 X 9 example

.0.0.1.0.0.0.1.0.0

.0.1.1.1.0.1.1.1.0

.1.1.1.0.0.0.1.1.1

.0.1.0.0.0.0.0.1.0

.0.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.0.1.0

.1.1.1.0.0.0.1.1.1

.0.1.1.1.0.1.1.1.0

.0.0.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A146607 A147072 A146068 * A146250 A232023 A146695

Adjacent sequences: A146908 A146909 A146910 * A146912 A146913 A146914

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved