A196855 Number of nX7 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,1,0,2,4 for x=0,1,2,3,4.

40, 6440, 363685, 28194191, 2069281146, 152929723254, 11300853019444, 835390769370971, 61745852507376150, 4563708721504197779, 337310171120447151691, 24931202561823495912020, 1842711946915214490433763

Offset: 1

Author

R. H. Hardin Oct 06 2011

Keywords

• nonn

Comments

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

Column 7 of A196856

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..50