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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A155244 Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,2 3,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 25, 55, 171, 2026, 22295, 155502, 1596524, 35243564, 954802663, 22309276431, 693242750587, 34923093286656, 2291347312062975 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

COMMENTS

Same series for 1,0 2,0 2,1 2,2 3,0 3,1 polyhexes.

LINKS

Table of n, a(n) for n=3..17.

EXAMPLE

Maximal 11 X 11 X 11 example

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

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

...........1.1.0

..........0.0.1.1

.........1.0.0.0.0

........1.0.0.0.1.0

.......0.1.1.0.0.1.1

......0.1.0.0.1.1.0.0

.....1.0.0.1.0.0.0.0.1

....0.1.1.0.1.1.0.1.1.0

...1.1.0.0.1.0.1.0.0.1.1

CROSSREFS

Sequence in context: A350156 A155250 A155260 * A155310 A155288 A155293

Adjacent sequences: A155241 A155242 A155243 * A155245 A155246 A155247

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 December 8 14:04 EST 2022. Contains 358693 sequences. (Running on oeis4.)