A266683 Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its northwest or northeast neighbor modulo 4 and the upper left element equal to 0.

6, 101, 2520, 77830, 2643025, 96489721, 3689693411, 146213224799, 5947278854261, 246989317561499, 10427536481704470, 446242967428521164, 19312763398154267341, 843835503392824253913, 37171868113841641865335

Offset: 1

Author

R. H. Hardin, Jan 02 2016

Keywords

• nonn

Comments

Row 4 of A266681.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..16

Crossrefs

Cf. A266681.