A197869 Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 1,4,0,1,1,0,0 for x=0,1,2,3,4,5,6

1, 4, 9, 20, 74, 379, 3003, 38251, 799417, 26052840, 1338355732, 107392201905

Offset

1,2

Comments

Every 0 is next to 0 1's, every 1 is next to 1 4's, every 2 is next to 2 0's, every 3 is next to 3 1's, every 4 is next to 4 1'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..12.

Example

Some solutions with all values from 0 to 6 for 8X8X8
.........2................0................1................2
........0.0..............0.0..............1.4..............0.0
.......0.0.2............2.0.0............1.1.1............0.0.0
......0.0.2.1..........1.2.0.0..........4.1.3.2..........0.0.6.0
.....0.5.2.1.4........4.1.2.5.0........1.1.2.0.0........0.5.0.0.2
....0.0.0.2.1.1......1.1.2.0.0.0......2.2.2.0.0.0......0.0.2.2.3.1
...0.0.6.0.3.1.1....1.1.3.0.0.6.0....0.0.0.5.0.6.0....0.0.2.1.1.1.4
..2.0.0.0.2.1.4.1..1.4.1.2.0.0.0.0..0.0.0.0.0.0.0.2..0.0.2.1.4.1.1.1

Crossrefs

Sequence in context: A130045 A225986 A147971 * A276319 A038805 A192162

Adjacent sequences: A197866 A197867 A197868 * A197870 A197871 A197872

Keyword

nonn

Author

R. H. Hardin Oct 18 2011

Status

approved