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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 0
1, 169, 239891, 3048698613, 350767341744137, 368448539594713382337, 3546881146489163009435488735 (list; graph; refs; listen; history; text; internal format)
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

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Last modified June 30 19:12 EDT 2022. Contains 354945 sequences. (Running on oeis4.)