A195229 Number of lower triangles of an n X n 0..5 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by one or less.

6, 36, 428, 9982, 459880, 42029278, 7640055854, 2767861764930, 2001526172413328, 2892451174381411040, 8361331814456905846790, 48387254396810574882721328, 560941284568012233398098984786, 13033945031291662448750033149621602

Offset: 1

Author

R. H. Hardin Sep 13 2011

Keywords

• nonn

Comments

Column 5 of A195232

Examples

			Some solutions for n=4
..0........3........0........4........0........2........2........2
..1.1......4.4......1.0......4.4......1.1......1.1......1.2......3.2
..0.1.0....4.3.3....1.0.1....4.5.5....2.1.1....2.1.1....2.2.2....3.3.2
..1.0.1.0..4.4.3.3..1.1.1.2..4.4.5.5..2.1.1.1..2.1.1.2..3.3.2.1..2.3.2.2
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..15