A267630 Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any west neighbor modulo 4 and the upper left element equal to 0.

6, 27, 208, 2386, 32208, 445970, 6039160, 80742586, 1086798652, 14898269746, 208430268352, 2964609577834, 42639468240764, 617605254789776, 8990677585470960, 131473208822453124, 1931423573382740480

Offset: 1

Author

R. H. Hardin, Jan 18 2016

Keywords

• nonn

Comments

Row 4 of A267629.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..21

Crossrefs

Cf. A267629.