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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A155378 Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,1 3,2 4,2 4,3 5,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 37, 67, 314, 2337, 14010, 66473, 405331, 3843288, 47944694, 600390745, 7673166649, 120741723116, 2464557255202 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..20.

EXAMPLE

Maximal 10 X 10 X 10 example

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

...........0.0

..........1.0.0

.........0.1.1.1

........0.1.1.1.0

.......0.0.0.0.1.0

......0.0.1.0.0.0.1

.....1.1.1.0.1.1.1.0

....0.1.1.1.0.1.1.1.0

...0.1.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A155412 A155420 A155434 * A155438 A155396 A155411

Adjacent sequences:  A155375 A155376 A155377 * A155379 A155380 A155381

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 | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

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

Last modified May 23 08:33 EDT 2013. Contains 225585 sequences.