A194618 Half the number of lower triangles of a 5 X 5 0..n array with no element equal to the average of its horizontal and vertical neighbors.

849, 571364, 86867366, 3703163910, 73569838704, 873084601728, 7416076339907, 47683223919057, 251059904306865, 1116910109397146, 4348691274427714, 15090969268080476, 47709109611064061, 138700124724207796

Offset: 1

Author

R. H. Hardin, Aug 30 2011

Keywords

• nonn

Examples

			Some solutions for n=2
..0..........0..........0..........0..........0..........0..........0
..2.0........2.0........2.0........1.0........2.0........1.0........2.0
..2.0.2......0.2.0......0.1.0......1.0.1......0.2.1......1.0.2......0.1.0
..2.2.0.1....1.2.2.0....1.1.0.1....0.1.1.2....0.1.2.0....1.0.0.0....2.2.2.0
..1.1.1.1.2..2.2.1.0.1..0.0.2.1.2..0.1.1.0.1..2.2.0.2.0..0.1.0.2.0..0.2.0.0.2
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..18

Crossrefs

Row 4 of A194615.