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!)
A155290 Number of ways to place zero or more nonadjacent 1,0 1,1 2,1 3,1 4,2 5,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 25, 64, 265, 1577, 11987, 107928, 1180991, 15701569, 264954393, 5697447937, 151647215266 (list; graph; refs; listen; history; text; internal format)
OFFSET
4,2
LINKS
EXAMPLE
Maximal 11 X 11 X 11 example
.............0
............0.1
...........0.1.1
..........1.1.0.0
.........1.0.0.1.1
........0.0.0.0.1.0
.......1.0.1.0.1.0.1
......1.0.0.1.0.1.0.1
.....0.1.0.1.0.1.0.1.0
....0.1.0.0.1.0.0.0.1.0
...0.1.1.0.1.1.0.0.1.1.0
CROSSREFS
Sequence in context: A001845 A127765 A155305 * A056685 A299262 A001296
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 March 29 06:57 EDT 2024. Contains 371265 sequences. (Running on oeis4.)