A220937 Equals two maps: number of 3Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..2 3Xn array

1, 12, 92, 673, 5912, 48212, 395844, 3232729, 26184472, 211363254

Offset

1,2

Comments

Row 3 of A220935

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A120990 A220330 A055022 * A221291 A044263 A044644

Adjacent sequences: A220934 A220935 A220936 * A220938 A220939 A220940

Keyword

nonn

Author

R. H. Hardin Dec 25 2012

Status

approved