A222427 Number of nX4 0..2 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order

3, 13, 75, 766, 7929, 88455, 1009168, 11742060, 136046418, 1597242853, 18702751927, 220911842244, 2604575617765, 30883966174713, 365980036374753, 4353382994459175, 51789654728027158, 617680862903883768

Offset

1,1

Comments

Column 4 of A222430

Links

R. H. Hardin, Table of n, a(n) for n = 1..78

Example

Some solutions for n=4
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..0..0..0..0....1..1..0..0....0..0..0..0....0..1..0..0....0..0..0..0
..1..0..0..0....1..1..1..1....0..1..0..0....2..0..0..0....1..0..0..1
..2..1..0..1....1..1..1..1....0..2..1..0....2..0..0..0....1..1..1..1

Crossrefs

Sequence in context: A032036 A305535 A300793 * A026072 A063646 A047730

Adjacent sequences: A222424 A222425 A222426 * A222428 A222429 A222430

Keyword

nonn

Author

R. H. Hardin Feb 19 2013

Status

approved