A203209 - OEIS

A203209

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

1, 7, 28, 287, 17975, 689715, 104189110, 37047634987, 20232260136382

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

OFFSET

1,2

COMMENTS

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

.......0.0............1.1............0.0............1.0............0.1

......0.6.0..........0.2.0..........0.6.0..........0.0.4..........4.0.0

.....4.0.0.1........4.0.0.4........1.0.0.4........0.0.0.0........0.0.6.0

....0.0.5.2.1......0.0.6.0.0......3.1.0.0.0......0.6.0.5.0......0.0.0.0.0

...1.2.0.0.2.0....1.5.0.0.2.1....1.2.0.1.5.0....0.0.0.0.2.1....1.2.0.5.0.1

..1.3.1.1.0.1.1..1.0.0.1.1.3.1..1.0.0.1.0.0.0..0.0.0.1.1.3.1..1.3.1.1.0.1.2

CROSSREFS

Sequence in context: A185360 A198028 A244300 * A193288 A050548 A261845

Adjacent sequences: A203206 A203207 A203208 * A203210 A203211 A203212

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 30 2011

STATUS

approved