A195219 Number of lower triangles of an n X n integer array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by 7 or less and triangles differing by a constant counted only once

1, 169, 239891, 3048698613, 350767341744137, 368448539594713382337, 3546881146489163009435488735

Offset

1,2

Comments

Column 7 of A195220

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for n=5
...0...............0...............0...............0...............0
...3..5............0..0............1..7............0.-3...........-5.-2
..-1.-1.-2.........6..0.-4.........2..0..0........-2.-1.-2........-5..1.-5
...2.-1..0..1......5..1.-3.-1......3..2..7..4.....-1..5..3..4.....-6.-5.-3.-9
...2.-3.-6.-5.-4...3..2..2.-3.-3..-3..2..6..8..1...3.-1..5..1..2..-2.-2.-2.-6-12

Crossrefs

Sequence in context: A069743 A210087 A135824 * A195276 A013753 A013867

Adjacent sequences: A195216 A195217 A195218 * A195220 A195221 A195222

Keyword

nonn

Author

R. H. Hardin Sep 13 2011

Status

approved