The On-Line Encyclopedia of Integer Sequences (OEIS)

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Number of ways to place zero or more nonadjacent 2,0 2,1 3,0 3,2 3,3 4,1 4,2 5,1 polyhexes in any orientation on a planar nXnXn triangular grid.
(history; published version)

#6 by Michael De Vlieger at Sun Nov 10 13:01:27 EST 2024

STATUS

proposed

approved

#5 by Michel Marcus at Sun Nov 10 12:42:55 EST 2024

STATUS

editing

proposed

#4 by Michel Marcus at Sun Nov 10 12:42:51 EST 2024

KEYWORD

nonn,more

AUTHOR

R. H. Hardin , Jan 22 2009

STATUS

approved

editing

#3 by Russ Cox at Sat Mar 31 12:35:23 EDT 2012

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net) _ Jan 22 2009

Discussion

Sat Mar 31

12:35

OEIS Server: https://oeis.org/edit/global/875

#2 by N. J. A. Sloane at Sat Oct 02 03:00:00 EDT 2010

KEYWORD

nonn,new

nonn

AUTHOR

Ron R. H. Hardin (rhhardin(AT)att.net) Jan 22 2009

#1 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009

NAME

Number of ways to place zero or more nonadjacent 2,0 2,1 3,0 3,2 3,3 4,1 4,2 5,1 polyhexes in any orientation on a planar nXnXn triangular grid.

DATA

1, 7, 19, 37, 76, 284, 1948, 12241, 60886, 350497, 2915669, 33310308, 416154595, 5212602941, 75431474711, 1382363604714, 31384746574285

OFFSET

5,2

EXAMPLE

Maximal 10 X 10 X 10 example

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

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

..........1.1.0

.........1.0.1.1

........0.1.1.0.0

.......0.1.0.0.1.0

......1.0.0.0.0.1.1

.....0.1.1.0.0.1.0.1

....0.1.0.1.1.0.1.1.0

...0.0.1.1.0.0.1.0.0.0

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Jan 22 2009

STATUS

approved