A240627 Number of nX4 0..3 arrays with no element equal to exactly two horizontal and vertical neighbors, with new values 0..3 introduced in row major order.

12, 1332, 180480, 24648700, 3367163455, 459961775083, 62832360051504, 8583108386132548, 1172481146489555199, 160164822767286567296, 21879047288760831684789, 2988750601081901561336772

Offset

1,1

Comments

Column 4 of A240629

Links

R. H. Hardin, Table of n, a(n) for n = 1..178

Example

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

Crossrefs

Sequence in context: A174745 A071309 A067108 * A007943 A015512 A004145

Adjacent sequences: A240624 A240625 A240626 * A240628 A240629 A240630

Keyword

nonn

Author

R. H. Hardin, Apr 09 2014

Status

approved