A203220 Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 6,2,1,0,0,0,1 for x=0,1,2,3,4,5,6

1, 4, 28, 463, 20863, 1908018, 410029022, 207200580086, 237986115130053

Offset

1,2

Comments

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

Links

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

Example

Some solutions with all values from 0 to 6 for 7X7X7
........2..............0..............2..............2..............0
.......1.1............0.0............1.1............1.1............0.3
......1.6.1..........0.5.0..........1.6.1..........1.6.1..........0.4.0
.....2.1.1.2........3.0.3.2........2.1.1.2........2.1.1.2........2.0.4.0
....0.0.4.0.0......0.4.0.1.1......0.3.0.3.0......0.0.0.0.3......1.1.0.4.0
...0.5.0.0.0.1....1.0.3.1.6.1....1.3.0.0.5.0....2.1.5.0.0.0....1.6.1.0.5.0
..0.3.0.4.0.2.1..2.1.0.2.1.1.2..2.1.0.4.0.0.0..1.0.0.0.4.0.0..2.1.1.2.0.0.0

Crossrefs

Sequence in context: A203032 A086812 A197872 * A338816 A111817 A134048

Adjacent sequences: A203217 A203218 A203219 * A203221 A203222 A203223

Keyword

nonn

Author

R. H. Hardin Dec 30 2011

Status

approved