A197860 Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 0,3,2,1,1,2,1 for x=0,1,2,3,4,5,6

1, 1, 7, 7, 278, 1563, 32827, 1212889, 38101597

Offset

1,3

Comments

Every 0 is next to 0 0's, every 1 is next to 1 3's, every 2 is next to 2 2's, every 3 is next to 3 1's, every 4 is next to 4 1's, every 5 is next to 5 2'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 8X8X8
.........2................0................0................0
........2.2..............2.2..............2.2..............2.2
.......1.1.1............2.5.2............2.5.2............2.0.2
......0.3.0.3..........0.2.0.2..........0.2.0.2..........2.5.2.0
.....2.2.1.1.1........1.3.2.2.1........1.3.2.2.1........0.2.2.3.1
....2.5.2.1.6.1......0.1.1.4.1.3......4.1.1.4.1.3......1.3.1.1.1.4
...2.0.2.3.1.1.3....1.1.6.1.1.2.1....1.1.6.1.1.2.1....2.1.0.1.6.1.1
..0.2.2.0.1.4.1.0..0.3.1.1.3.2.2.0..0.3.1.1.3.2.2.0..2.2.1.3.1.1.3.0

Crossrefs

Sequence in context: A261128 A353583 A048430 * A180321 A213150 A239152

Adjacent sequences: A197857 A197858 A197859 * A197861 A197862 A197863

Keyword

nonn

Author

R. H. Hardin Oct 18 2011

Status

approved