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A195276 Number of lower triangles of an n X n integer array with each element differing from all of its vertical and horizontal neighbors by 6 or less and triangles differing by a constant counted only once 0
1, 169, 248261, 3249312469, 383752106451389, 411207789366962687359, 4011033701337366560359871745 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 6 of A195278

LINKS

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

EXAMPLE

Some solutions for n=5

...0...............0...............0...............0...............0

..-6.-1...........-1..3...........-3.-8............3..9...........-2.-7

.-10.-6.-8........-6.-1..3.........1.-5.-8........-1..5..5.........1.-1.-7

.-15-10.-6.-9.....-9.-4.-2.-2......2..1.-2..2......3..7..4..2......1..0.-1..2

.-17-14-12.-9.-8.-10.-8.-4.-2..3...2..4.-1.-4.-6...1..6..4..5..0...5.-1.-7.-2..4

CROSSREFS

Sequence in context: A210087 A135824 A195219 * A013753 A013867 A074666

Adjacent sequences:  A195273 A195274 A195275 * A195277 A195278 A195279

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 14 2011

STATUS

approved

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Last modified May 19 15:03 EDT 2022. Contains 353834 sequences. (Running on oeis4.)