A207151 - OEIS

A207151

Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 6,3,2,0,2,0,2 for x=0,1,2,3,4,5,6

1, 2, 20, 252, 7422, 424316, 53078115, 13870207250, 7439765626245

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Every 0 is next to 0 6's, every 1 is next to 1 3's, every 2 is next to 2 2's, every 3 is next to 3 0's, every 4 is next to 4 2's, every 5 is next to 5 0's, every 6 is next to 6 2's

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions with all values from 0 to 6 for 7X7X7

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

.......0.0............3.1............0.2............0.0............3.0

......1.3.0..........0.0.0..........0.2.2..........0.5.0..........0.2.2

.....2.2.1.0........0.0.2.2........3.1.4.0........0.0.2.2........0.2.6.2

....0.2.4.2.2......2.2.4.2.0......0.0.2.2.0......2.2.4.2.0......2.4.2.2.0

...0.5.0.2.6.2....2.6.2.0.5.0....0.5.2.6.2.0....2.6.2.0.0.3....2.2.0.0.5.0

..0.0.0.0.2.2.0..0.2.2.0.0.0.0..0.0.0.2.2.0.0..0.2.2.0.0.1.0..0.0.1.3.0.0.0

CROSSREFS

Sequence in context: A109106 A099976 A195157 * A272568 A229727 A325409

Adjacent sequences: A207148 A207149 A207150 * A207152 A207153 A207154

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 15 2012

STATUS

approved