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A195274 Number of lower triangles of an n X n integer array with each element differing from all of its vertical and horizontal neighbors by 4 or less and triangles differing by a constant counted only once 0
1, 81, 39609, 119743353, 2266745635377, 270149651796118149, 203368493873412168605037, 969036564714736790447759054277 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A195278

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=5

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

...1..4............1..1............1..0............2..5...........-3.-1

..-1..3..2.........4..3..7.........3..0..4.........1..2..6........-6.-5.-9

..-4.-1..3..7......3..6.10..7......1..2..0.-3......0..0..2..4.....-6.-7.-8-10

...0.-3..0..4..2...4..4..8..9..6...0..3..2..1..4..-4.-4.-1..2..2.-10-10.-8-11-13

CROSSREFS

Sequence in context: A017200 A017308 A017428 * A189149 A088188 A017560

Adjacent sequences:  A195271 A195272 A195273 * A195275 A195276 A195277

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 14 2011

STATUS

approved

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Last modified September 19 18:29 EDT 2020. Contains 337181 sequences. (Running on oeis4.)