A195245 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 two or less.

6, 84, 3776, 533142, 237368212, 333437946202, 1479091549959182, 20728220266936919766, 918037571811526229736636, 128523191925989407344147529338, 56883358880979630186940014533369490

Offset: 1

Author

R. H. Hardin Sep 13 2011

Keywords

• nonn

Comments

Column 5 of A195248

Examples

			Some solutions for n=5
..4..........2..........2..........1..........1..........3..........4
..2.4........2.4........1.2........3.1........2.3........2.2........3.4
..2.3.5......3.3.3......3.2.0......3.2.2......3.3.4......2.3.2......3.4.2
..4.4.5.4....2.2.3.4....4.2.0.2....3.4.3.2....5.3.4.4....1.1.3.4....4.4.3.2
..4.5.3.5.3..4.4.2.2.3..2.2.1.0.1..4.3.2.4.4..5.4.5.3.2..2.2.2.4.3..5.4.2.3.3
		

Links

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