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

 

Logo

Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A155222 Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 13, 37, 184, 1433, 15532, 213600, 3754855, 93144364, 3159998575, 143228568126, 8737142545792, 720729233703571 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

LINKS

Table of n, a(n) for n=3..15.

EXAMPLE

Maximal 12 X 12 X 12 example

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

.............1.1

............0.0.1

...........1.0.0.1

..........1.0.0.0.0

.........0.1.0.0.1.1

........1.0.1.0.1.0.0

.......0.1.0.0.1.0.1.0

......0.0.1.1.0.0.1.0.1

.....1.1.0.0.0.1.1.0.0.1

....1.0.0.0.1.0.0.0.1.0.1

...1.0.1.1.1.0.1.1.1.0.1.0

CROSSREFS

Sequence in context: A147615 A173872 A155241 * A155283 A155282 A193646

Adjacent sequences:  A155219 A155220 A155221 * A155223 A155224 A155225

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 | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified July 26 09:22 EDT 2014. Contains 244925 sequences.