A222286 Number of nX4 0..1 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..1 order

3, 11, 35, 208, 1125, 6619, 40321, 250681, 1569385, 9860229, 62350467, 395971584, 2523482587, 16126203359, 103311906743, 663339238220, 4267302505247, 27498492193747, 177468748791963, 1146905501859999, 7421110682709531

Offset

1,1

Comments

Column 4 of A222290

Links

R. H. Hardin, Table of n, a(n) for n = 1..136

Example

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

Crossrefs

Sequence in context: A014335 A147474 A247417 * A119143 A119092 A119177

Adjacent sequences: A222283 A222284 A222285 * A222287 A222288 A222289

Keyword

nonn

Author

R. H. Hardin Feb 14 2013

Status

approved