A197474 Number of nX7 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,1,0,0,0 for x=0,1,2,3,4.

5, 98, 1300, 10934, 151748, 1265828, 16544206, 145244408, 1830370547, 16537658774, 202870487557, 1878224690406, 22527034080238, 212875475502774, 2505004507267645, 24087191716817350, 278905922435987885

Offset: 1

Author

R. H. Hardin Oct 15 2011

Keywords

• nonn

Comments

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

Column 7 of A197475

Examples

			Some solutions containing all values 0 to 4 for n=4
..2..0..1..1..0..3..0....1..0..3..0..2..1..1....1..1..2..0..1..2..0
..0..4..0..2..1..0..3....1..2..0..4..0..2..0....0..3..0..2..1..0..3
..1..0..4..0..1..2..0....0..2..1..0..3..1..2....3..0..3..1..0..4..0
..1..2..0..3..0..1..1....2..0..1..2..0..1..0....0..3..0..1..2..0..2
		

Links

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