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Number of ways to place zero or more nonadjacent 2,0 3,0 4,1 4,2 4,3 4,4 5,1 6,2 polyhexes in any orientation on a planar nXnXn triangular grid.
(history; published version)

#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 3,0 4,1 4,2 4,3 4,4 5,1 6,2 polyhexes in any orientation on a planar nXnXn triangular grid.

DATA

1, 7, 19, 37, 61, 215, 976, 6510, 31895, 148311, 835105, 6965183, 70259384, 771053702, 8287139754, 101882179551

OFFSET

6,2

EXAMPLE

Maximal 11 X 11 X 11 example

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

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

...........1.0.0

..........1.0.0.0

.........0.1.1.1.1

........0.1.0.0.0.0

.......1.0.1.0.1.0.0

......0.1.0.0.0.1.0.0

.....0.0.1.0.1.0.1.0.1

....0.0.0.1.1.0.0.1.1.0

...0.0.1.1.0.0.1.1.0.0.0

KEYWORD

nonn

AUTHOR

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

STATUS

approved