A195977 Number of nX7 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,1,3,4 for x=0,1,2,3,4.

25, 139, 240, 455, 1072, 2718, 5637, 12823, 30486, 72042, 166884, 390514, 917562, 2167323, 5114140, 12071815, 28523614, 67538866, 159964100, 378996636, 898240293, 2130429190, 5054033816, 11993264778, 28464315995, 67574829560

Offset: 1

Author

R. H. Hardin Sep 25 2011

Keywords

• nonn

Comments

Every 0 is next to 0 2's, every 1 is next to 1 0'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 A195978

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..200