A220340 Equals two maps: number of nX3 binary arrays indicating the locations of corresponding elements equal to exactly two of their king-move neighbors in a random 0..3 nX3 array

2, 24, 355, 3281, 28993, 242224, 1973258, 15900432, 127519660, 1021016815, 8170267047, 65367230164, 522949458612, 4183621403993, 33469026735934, 267752331337587

Offset

1,1

Comments

Column 3 of A220342

Links

Table of n, a(n) for n=1..16.

Example

Some solutions for n=3
..0..0..1....0..1..1....0..1..0....0..0..0....0..0..1....1..1..0....0..1..0
..1..0..1....1..1..0....1..1..0....1..1..0....1..0..0....0..1..1....0..0..1
..1..1..0....0..0..0....0..0..1....1..1..0....1..1..0....0..0..0....1..1..0

Crossrefs

Sequence in context: A262291 A043699 A220317 * A366003 A134805 A119702

Adjacent sequences: A220337 A220338 A220339 * A220341 A220342 A220343

Keyword

nonn

Author

R. H. Hardin Dec 11 2012

Status

approved