login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A166198 Number of nXnXn triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= 3 1
1, 4, 2, 3, 14, 30, 89, 553, 1588, 8865, 104510, 444424, 4173156, 81325310, 652489468, 10459516337, 342881668736, 4580518588744, 125220290825340, 7022575980797573, 156952369257684587 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..20.

EXAMPLE

All solutions for n=4

.....1........0........0........2........1........1........0........0...

....0.1......0.1......0.0......0.0......0.0......0.0......0.0......1.0..

...1.0.0....1.0.0....0.2.0....0.1.0....0.1.0....0.2.0....0.3.0....0.0.1.

..1.0.1.1..0.0.1.0..0.0.0.0..2.0.0.2..1.0.0.1..1.0.0.1..0.0.0.0..0.1.0.0

------

.....0........1........1........0........2........3...

....0.0......1.0......0.0......0.0......0.0......0.0..

...0.0.0....0.0.1....0.0.0....0.1.0....0.0.0....0.0.0.

..0.0.0.0..1.1.0.1..1.0.0.1..0.0.0.0..2.0.0.2..3.0.0.3

CROSSREFS

Sequence in context: A282772 A227041 A098046 * A248252 A117238 A197291

Adjacent sequences:  A166195 A166196 A166197 * A166199 A166200 A166201

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 09 2009

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 23 22:20 EDT 2019. Contains 326254 sequences. (Running on oeis4.)