A196137 Number of nX7 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,2,1,3,4 for x=0,1,2,3,4.

3, 46, 117, 931, 3288, 20706, 75720, 384083, 1662512, 8212668, 37172701, 176457313, 803299589, 3768617073, 17355787464, 81234030372, 376860933270, 1753580102111, 8135995110263, 37838340282830, 175764796211917, 817275191103917

Offset: 1

Author

R. H. Hardin Sep 28 2011

Keywords

• nonn

Comments

Every 0 is next to 0 0's, every 1 is next to 1 2's, every 2 is next to 2 1's, every 3 is next to 3 3's, every 4 is next to 4 4's

Column 7 of A196138

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..142