login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A155374 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 2,1 3,0 3,1 4,1 5,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 52, 254, 1061, 4586, 28708, 218507, 1736540, 17357415, 205447067, 2686619638 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

LINKS

Table of n, a(n) for n=5..17.

EXAMPLE

Maximal 9 X 9 X 9 example

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

..........0.1

.........1.1.0

........1.1.0.1

.......1.1.0.0.1

......1.0.0.0.1.1

.....0.0.0.0.0.1.1

....1.1.1.1.0.0.1.0

...0.0.1.1.1.1.0.1.0

CROSSREFS

Sequence in context: A155419 A155246 A155414 * A155272 A092053 A072630

Adjacent sequences:  A155371 A155372 A155373 * A155375 A155376 A155377

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 29 13:17 EST 2021. Contains 349416 sequences. (Running on oeis4.)