A200799 Number of n X 6 0..3 arrays with values 0..3 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.

187, 622645, 2060918000, 6852264918471, 22781978610167987, 75743730886453371522, 251826890612151285556718, 837254535307721417534184492, 2783639010978210077196779661724

Offset: 1

Author

R. H. Hardin, Nov 22 2011

Keywords

• nonn

Comments

Column 6 of A200801.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..28

Crossrefs

Cf. A200801.