A222669 Number of nX4 0..2 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order

3, 9, 40, 348, 2370, 20606, 212842, 2134959, 21085549, 211716164, 2136631932, 21522095442, 217024139551, 2193065402495, 22187387560680, 224679112979344, 2277631748750522, 23112487299379689, 234748284433308243

Offset

1,1

Comments

Column 4 of A222673

Links

R. H. Hardin, Table of n, a(n) for n = 1..126

Example

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

Crossrefs

Sequence in context: A346753 A233533 A190341 * A179088 A027893 A018417

Adjacent sequences: A222666 A222667 A222668 * A222670 A222671 A222672

Keyword

nonn

Author

R. H. Hardin Feb 28 2013

Status

approved