A195228 Number of lower triangles of an n X n 0..4 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by one or less

5, 29, 337, 7705, 348849, 31374671, 5618308863, 2006626824777, 1431393426377379, 2041526404394580503, 5826929219460553056125, 33306813274969071019847237, 381509343842237775318179191165, 8761682347863104757428803661222769

Offset

1,1

Comments

Column 4 of A195232

Links

R. H. Hardin, Table of n, a(n) for n = 1..16

Example

Some solutions for n=4
..1........1........2........2........3........0........3........1
..2.1......2.1......1.2......1.1......3.2......0.0......4.4......1.2
..1.2.2....1.1.1....2.1.2....1.1.0....2.2.2....0.1.0....4.4.3....2.2.2
..1.1.2.3..1.0.1.2..1.2.1.2..1.0.1.1..2.2.3.2..0.1.1.1..4.4.4.3..1.1.2.2

Crossrefs

Sequence in context: A332469 A112799 A020531 * A226668 A226666 A366411

Adjacent sequences: A195225 A195226 A195227 * A195229 A195230 A195231

Keyword

nonn

Author

R. H. Hardin Sep 13 2011

Status

approved