A194994 Number of lower triangles of an n X n 0..4 array with each element differing from all of its horizontal and vertical neighbors by one

5, 14, 66, 458, 4990, 81014, 2059822, 78060014, 4641074078, 410310652370, 57068977108754, 11768868532345686, 3829513291002131546, 1842092248483706146126, 1402261360946084657783246

Offset

1,1

Comments

Column 4 of A194998

Links

R. H. Hardin, Table of n, a(n) for n = 1..24

Example

Some solutions for 4X4
..3........2........2........2........2........4........1........4
..2.1......1.0......3.2......3.4......3.2......3.2......2.3......3.2
..3.2.3....0.1.2....2.3.2....2.3.4....2.3.2....2.3.4....3.2.3....4.3.4
..2.1.2.3..1.0.1.2..1.2.3.2..1.2.3.4..1.2.1.2..1.2.3.4..2.1.2.1..3.4.3.2

Crossrefs

Sequence in context: A256413 A346212 A324011 * A166795 A128102 A304060

Adjacent sequences: A194991 A194992 A194993 * A194995 A194996 A194997

Keyword

nonn

Author

R. H. Hardin Sep 07 2011

Status

approved