A222743 Number of nX4 0..3 arrays with exactly floor(nX4/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order

6, 657, 126947, 27397461, 6178897165, 1424636571214, 332960192034230, 78562540663580982, 18671065206165526715, 4462727856303175610197, 1071642436817030793550208, 258331591188039785463763488

Offset

1,1

Comments

Column 4 of A222747

Links

R. H. Hardin, Table of n, a(n) for n = 1..99

Example

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

Crossrefs

Sequence in context: A321425 A220858 A337652 * A222720 A309597 A269842

Adjacent sequences: A222740 A222741 A222742 * A222744 A222745 A222746

Keyword

nonn

Author

R. H. Hardin Mar 04 2013

Status

approved