A195230 Number of lower triangles of an n X n 0..6 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by one or less

7, 43, 519, 12259, 570911, 52683885, 9661943973, 3529267255201, 2571928557261907, 3744070741500225585, 10898903552323266521821, 63494356952926436300329797, 740796894931520786982829942993

Offset

1,1

Comments

Column 6 of A195232

Links

R. H. Hardin, Table of n, a(n) for n = 1..15

Example

Some solutions for n=4
..6........4........5........4........2........2........3........2
..5.5......4.4......4.5......4.4......2.3......2.2......4.4......1.2
..5.6.5....4.4.3....4.4.4....5.5.5....3.3.3....2.2.2....3.3.3....1.1.1
..6.6.5.4..4.3.3.4..3.4.4.3..5.6.5.6..2.2.2.3..1.2.1.1..3.4.4.3..1.0.1.1

Crossrefs

Sequence in context: A294361 A345075 A204733 * A316635 A222981 A023316

Adjacent sequences: A195227 A195228 A195229 * A195231 A195232 A195233

Keyword

nonn

Author

R. H. Hardin Sep 13 2011

Status

approved