A199095 Number of nX2 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to two or fewer horizontal or vertical neighbors

1, 6, 15, 280, 2040, 5503, 113010, 857532, 2340127, 50784920, 395160694, 1085939598, 24341903776, 192371505064, 530944513322, 12155425553076, 97080455287086, 268728663225260, 6244348288426664, 50251726336557552

Offset

1,2

Comments

Column 2 of A199101

Links

R. H. Hardin, Table of n, a(n) for n = 1..89

Example

Some solutions for n=3
..0..1....0..0....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1
..2..1....1..2....1..0....2..0....0..2....1..2....2..2....2..1....1..2....2..2
..0..2....1..2....2..2....1..2....1..2....2..0....1..0....2..0....0..2....0..1

Crossrefs

Sequence in context: A117062 A003155 A335578 * A235230 A024081 A145558

Adjacent sequences: A199092 A199093 A199094 * A199096 A199097 A199098

Keyword

nonn

Author

R. H. Hardin Nov 02 2011

Status

approved