A195230 Number of lower triangles of an n X n 0..6 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by one or less.

7, 43, 519, 12259, 570911, 52683885, 9661943973, 3529267255201, 2571928557261907, 3744070741500225585, 10898903552323266521821, 63494356952926436300329797, 740796894931520786982829942993

Offset: 1

Author

R. H. Hardin Sep 13 2011

Keywords

• nonn

Comments

Column 6 of A195232

Examples

			Some solutions for n=4
..6........4........5........4........2........2........3........2
..5.5......4.4......4.5......4.4......2.3......2.2......4.4......1.2
..5.6.5....4.4.3....4.4.4....5.5.5....3.3.3....2.2.2....3.3.3....1.1.1
..6.6.5.4..4.3.3.4..3.4.4.3..5.6.5.6..2.2.2.3..1.2.1.1..3.4.4.3..1.0.1.1
		

Links

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