A222576 Number of 4Xn 0..2 arrays with no more than floor(4Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order

14, 18, 120, 435, 3516, 25441, 212957, 1933819, 17971162, 172292518, 1649722196, 15907967878, 153952727468, 1485280127413, 14446587454682, 139301828808661, 1359137046700841

Offset

1,1

Comments

Row 4 of A222573

Links

Table of n, a(n) for n=1..17.

Example

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

Crossrefs

Sequence in context: A328239 A186120 A065343 * A165228 A205866 A248134

Adjacent sequences: A222573 A222574 A222575 * A222577 A222578 A222579

Keyword

nonn

Author

R. H. Hardin Feb 25 2013

Status

approved