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!)
A155441 Number of ways to place zero or more nonadjacent 2,1 3,0 3,1 3,3 4,2 4,3 5,1 5,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 61, 224, 1849, 11422, 49981, 224398, 1780640, 22690257, 281350590, 2951548767, 34313995173, 571260880157, 12982237127311 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..21.

EXAMPLE

Maximal 10 X 10 X 10 example

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

...........0.1

..........1.0.1

.........0.1.1.0

........0.1.0.1.0

.......0.0.0.1.0.0

......0.1.1.0.0.1.0

.....1.1.0.0.1.0.1.1

....1.0.1.1.0.1.1.0.0

...0.0.1.0.0.0.0.1.1.0

CROSSREFS

Sequence in context: A155373 A155444 A155439 * A155447 A155340 A155409

Adjacent sequences:  A155438 A155439 A155440 * A155442 A155443 A155444

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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 28 05:47 EDT 2022. Contains 354112 sequences. (Running on oeis4.)