A196803 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,2,3,0,1 for x=0,1,2,3,4.

1, 1, 16, 193, 19449, 2535368, 1436535356, 2099296647197, 9043086011797968, 109561680407727718539

Offset: 1

Author

R. H. Hardin, Oct 06 2011

Keywords

• nonn

Comments

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

Diagonal of A196809.

Examples

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

Crossrefs

Cf. A196809.