A147284 - OEIS

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A147284

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

1, 1, 1, 1, 1, 1, 1, 1, 221, 439, 5873, 13627, 205453

(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

.0.1.1.1.0.1.1.1.0

.0.1.0.0.0.0.0.1.0

.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

.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

CROSSREFS

Sequence in context: A052478 A257752 A375463 * A171427 A211817 A157490

Adjacent sequences: A147281 A147282 A147283 * A147285 A147286 A147287

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved