A147148 - OEIS

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A147148

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1100-0111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 235, 445, 4871, 12101, 166515, 463179, 23308741, 79047775, 13213403375, 57895847749, 14383899135941, 78923584929677, 26055907898557893, 175611010189141581

(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

.1.0.0.0.0.0.0.0.1

.1.1.0.0.0.0.0.1.1

.0.1.1.1.0.1.1.1.0

.1.0.1.0.0.0.1.0.1

.1.1.0.0.0.0.0.1.1

.0.1.1.1.0.1.1.1.0

.0.0.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A218038 A132903 A247474 * A173629 A097487 A091427

Adjacent sequences: A147145 A147146 A147147 * A147149 A147150 A147151

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved