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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A155349 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,1 4,2 5,1 5,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 100, 428, 1794, 11180, 68280, 460602, 3595480, 35769940, 408682401, 5473453986, 84561686844 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..19.

EXAMPLE

Maximal 10 X 10 X 10 example

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

...........1.0

..........1.0.0

.........0.1.1.1

........0.0.0.0.1

.......0.1.0.0.1.0

......0.0.1.0.0.0.0

.....1.1.1.0.0.0.1.1

....1.0.0.0.1.0.1.0.1

...0.1.0.0.0.1.1.0.0.0

CROSSREFS

Sequence in context: A155431 A155329 A155424 * A155437 A155299 A155379

Adjacent sequences:  A155346 A155347 A155348 * A155350 A155351 A155352

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 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 22 02:44 EDT 2019. Contains 326169 sequences. (Running on oeis4.)