A198526 Number of nX6 0..4 arrays with values 0..4 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.

202, 1948672, 26670041125, 371815743708461, 5186266567454077293, 72341858272434900016248, 1009078065869144136137180812, 14075371934477934686865356966591, 196333764385468923490801365319931630

Offset: 1

Author

R. H. Hardin Oct 26 2011

Keywords

• nonn

Comments

Column 6 of A198528

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..11