A220341 Equals two maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly two of their king-move neighbors in a random 0..3 nX4 array

4, 89, 3281, 60003, 1022813, 16673578

Offset

1,1

Comments

Column 4 of A220342

Links

Table of n, a(n) for n=1..6.

Example

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

Crossrefs

Sequence in context: A262409 A183880 A220318 * A184955 A205295 A292304

Adjacent sequences: A220338 A220339 A220340 * A220342 A220343 A220344

Keyword

nonn

Author

R. H. Hardin Dec 11 2012

Status

approved