A222829 Number of nX2 0..3 arrays with exactly floor(nX2/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order

0, 4, 32, 613, 7152, 117140, 1613820, 24884991, 363921808, 5535894434, 82950103964, 1261556870873, 19123754052912, 291751166759784, 4451928929497276, 68156252881621777, 1044588670185838192

Offset

1,2

Comments

Column 2 of A222832

Links

R. H. Hardin, Table of n, a(n) for n = 1..207

Example

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

Crossrefs

Sequence in context: A013041 A006024 A118995 * A134087 A132854 A136471

Adjacent sequences: A222826 A222827 A222828 * A222830 A222831 A222832

Keyword

nonn

Author

R. H. Hardin Mar 06 2013

Status

approved