A195244 Number of lower triangles of an n X n 0..4 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by two or less.

5, 65, 2729, 357847, 147824001, 192172956591, 786909681200387, 10151817642632605643, 412697709382902984293947, 52873327059079066189496492173, 21349480944940442832764307444766199

Offset: 1

Author

R. H. Hardin Sep 13 2011

Keywords

• nonn

Comments

Column 4 of A195248

Examples

			Some solutions for n=5
..0..........4..........3..........0..........3..........4..........4
..2.0........3.3........1.3........2.2........2.3........4.2........4.4
..2.0.1......2.2.2......1.2.2......4.3.1......4.2.3......4.2.0......2.4.4
..0.2.0.2....0.2.0.1....1.1.2.4....4.3.2.3....2.3.3.3....4.2.0.0....3.3.3.3
..0.1.2.2.1..0.2.2.1.1..1.3.3.4.3..3.3.2.3.2..4.3.1.2.4..3.2.1.2.0..1.3.1.2.1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..12