A266633 Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north, west, southeast or southwest neighbor modulo 4 and the upper left element equal to 0.

2, 13, 64, 438, 3265, 27626, 266481, 2864371, 35114131, 464035512, 6667852532, 98820516955, 1532710572338, 23969806110837, 385047836389356, 6188649148695409, 101271861590190111, 1654630392726835980

Offset

1,1

Comments

Row 4 of A266632.

Links

R. H. Hardin, Table of n, a(n) for n = 1..22

Example

Some solutions for n=4
..0..3..1..1....0..2..1..3....0..2..1..3....0..2..0..2....0..2..0..2
..0..2..1..3....3..1..0..2....3..1..3..2....3..1..3..1....3..1..3..2
..3..2..0..3....2..0..3..1....1..0..2..0....1..3..2..0....2..0..3..1
..2..1..0..2....1..3..2..0....0..2..1..3....3..2..1..0....1..3..1..0

Crossrefs

Cf. A266632.

Sequence in context: A211067 A296435 A127531 * A037745 A037626 A160459

Adjacent sequences: A266630 A266631 A266632 * A266634 A266635 A266636

Keyword

nonn

Author

R. H. Hardin, Jan 01 2016

Status

approved