A147276 - OEIS

A147276

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1100-0111-0001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 225, 445, 5061, 12325, 159173, 439491, 12030763, 38257835, 4443537629, 17894441301, 5108288425395, 26137633294785, 7314126561550685

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

OFFSET

1,9

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.1.0.1.0.0.0

.0.1.1.1.0.1.1.1.0

.1.1.0.0.0.0.0.1.1

.1.0.0.0.0.0.0.0.1

.0.0.0.0.0.0.0.0.0

.1.0.0.0.0.0.0.0.1

.1.1.1.0.0.0.1.1.1

.0.0.1.1.0.1.1.0.0

.0.0.0.1.0.1.0.0.0

CROSSREFS

Sequence in context: A373087 A216419 A246199 * A219022 A193003 A287298

Adjacent sequences: A147273 A147274 A147275 * A147277 A147278 A147279

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved