A195250 Number of lower triangles of a 4X4 0..n array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by two or less

1024, 59049, 190514, 357847, 533142, 709613, 886084, 1062555, 1239026, 1415497, 1591968, 1768439, 1944910, 2121381, 2297852, 2474323, 2650794, 2827265, 3003736, 3180207, 3356678, 3533149, 3709620, 3886091, 4062562, 4239033, 4415504, 4591975

Offset

1,1

Comments

Row 4 of A195248

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Formula

Empirical: a(n) = 176471*n - 349213 for n>4

Example

Some solutions for n=5
..2........5........3........0........5........1........2........3
..0.0......4.3......2.1......0.2......5.5......0.0......0.2......1.2
..1.2.1....4.3.1....0.2.2....0.1.3....5.5.3....0.2.1....1.1.1....2.0.2
..2.1.3.2..3.3.1.0..1.0.1.2..0.2.2.2..4.4.5.4..0.1.0.0..2.0.1.2..2.0.1.0

Crossrefs

Sequence in context: A182682 A305941 A351198 * A016901 A017684 A008454

Adjacent sequences: A195247 A195248 A195249 * A195251 A195252 A195253

Keyword

nonn

Author

R. H. Hardin Sep 13 2011

Status

approved