A266869 Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its west or northeast neighbor modulo 4 and the upper left element equal to 0.

6, 72, 1304, 31501, 843874, 24244702, 728850883, 22663306978, 723210750621, 23536767146485, 778080992727147, 26055452315387786, 881920582298144042, 30122404974018012719, 1036868581470252969758, 35932758405637296245430

Offset

1,1

Comments

Row 4 of A266867.

Links

R. H. Hardin, Table of n, a(n) for n = 1..20

Example

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

Crossrefs

Cf. A266867.

Sequence in context: A214875 A047058 A202382 * A001763 A003235 A113133

Adjacent sequences: A266866 A266867 A266868 * A266870 A266871 A266872

Keyword

nonn

Author

R. H. Hardin, Jan 04 2016

Status

approved