A220958 Equals two maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..3 nX4 array

4, 76, 1769, 33708, 590009, 10032271, 165226050, 2688227848

Offset

1,1

Comments

Column 4 of A220959

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A214814 A144210 A220793 * A187542 A364111 A009631

Adjacent sequences: A220955 A220956 A220957 * A220959 A220960 A220961

Keyword

nonn

Author

R. H. Hardin Dec 26 2012

Status

approved