A194617 Half the number of lower triangles of a 4 X 4 0..n array with no element equal to the average of its horizontal and vertical neighbors.

47, 4322, 132214, 1674043, 12561823, 66369488, 279618492, 975189851, 2972844263, 8086809479, 20111108169, 46277171169, 100029289052, 204344500677, 398372414831, 744412292078, 1341415693780, 2338177034539, 3960008651919

Offset: 1

Author

R. H. Hardin, Aug 30 2011

Keywords

• nonn

Examples

			Some solutions for n=2
..1........1........0........1........1........1........2........0
..0.1......0.2......2.2......2.0......2.2......2.2......0.2......2.0
..0.1.0....1.2.0....0.0.2....1.2.1....1.1.0....0.0.1....1.1.0....0.1.1
..0.2.2.0..2.0.0.1..1.0.0.2..0.0.2.1..1.2.0.2..1.0.0.1..1.0.0.1..2.0.2.1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..50

Crossrefs

Row 3 of A194615.