A267284 Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any southwest or northwest neighbors modulo 4 and the upper left element equal to 0.

6, 5, 24, 137, 1138, 12214, 104742, 741057, 5022782, 35540696, 271621650, 2252475421, 19535278570, 168510129798, 1410939522686, 11518135263919, 93278847927814, 762132469855714, 6339718207407286, 53641859402324039

Offset: 1

Author

R. H. Hardin, Jan 12 2016

Keywords

• nonn

Comments

Row 4 of A267278.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..24

Crossrefs

Cf. A267278.