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

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
.0.0.0.0.0.0.0.0.0
.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: A132903 A385536 A247474 * A173629 A097487 A091427

Adjacent sequences: A147145 A147146 A147147 * A147149 A147150 A147151

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved