A222645 Number of nX4 0..2 arrays with no more than floor(nX4/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order

4, 12, 61, 457, 3411, 31487, 317655, 3161392, 31436637, 315944445, 3182997999, 32059374557, 323386403994, 3267568146811, 33053624461081, 334704837151091, 3392894959638835, 34428005433287948, 349661755820884825

Offset

1,1

Comments

Column 4 of A222649

Links

R. H. Hardin, Table of n, a(n) for n = 1..128

Example

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

Crossrefs

Sequence in context: A097250 A188328 A291772 * A259816 A353452 A071769

Adjacent sequences: A222642 A222643 A222644 * A222646 A222647 A222648

Keyword

nonn

Author

R. H. Hardin Feb 27 2013

Status

approved