A197932 Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 4,4,2,2,1,0,2 for x=0,1,2,3,4,5,6

1, 2, 8, 27, 375, 3957, 98265, 4450117, 311193258, 39198288628

Offset

1,2

Comments

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

Links

Table of n, a(n) for n=1..10.

Example

Some solutions with all values from 0 to 6 for 7X7X7
........0..............1..............0..............1..............0
.......0.0............1.4............0.0............4.1............2.0
......0.5.0..........0.1.1..........0.5.0..........1.1.0..........2.2.1
.....0.0.2.2........0.0.0.0........0.0.1.1........0.0.5.0........3.3.4.1
....2.2.1.2.3......0.5.0.2.2......2.2.1.4.1......2.2.0.0.0......2.2.1.1.0
...2.6.2.4.1.2....0.2.0.2.6.2....2.6.2.3.2.0....2.6.2.0.2.0....2.6.2.0.5.0
..0.2.2.1.1.2.2..0.2.2.3.2.2.0..0.2.2.3.2.2.0..0.2.2.3.2.2.0..0.2.2.0.0.0.0

Crossrefs

Sequence in context: A276940 A287204 A299640 * A170871 A245996 A229935

Adjacent sequences: A197929 A197930 A197931 * A197933 A197934 A197935

Keyword

nonn

Author

R. H. Hardin Oct 19 2011

Status

approved