login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 14 2011
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 15 19:27 EDT 2024. Contains 374334 sequences. (Running on oeis4.)