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

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