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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 1
7, 43, 519, 12259, 570911, 52683885, 9661943973, 3529267255201, 2571928557261907, 3744070741500225585, 10898903552323266521821, 63494356952926436300329797, 740796894931520786982829942993 (list; graph; refs; listen; history; text; internal format)
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

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Last modified August 3 14:40 EDT 2021. Contains 346438 sequences. (Running on oeis4.)