A197991 Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 2,1,1,0,3,0,0 for x=0,1,2,3,4,5,6

1, 7, 22, 257, 5769, 258173, 21854361, 3617298480, 1166269109887, 731687066483043

Offset

1,2

Comments

Every 0 is next to 0 2's, every 1 is next to 1 1's, every 2 is next to 2 1's, every 3 is next to 3 0's, every 4 is next to 4 3'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..10.

Example

Some solutions with all values from 0 to 6 for 7X7X7
........0..............2..............0..............2..............2
.......0.0............1.1............0.0............1.1............1.1
......0.6.0..........0.0.3..........0.6.0..........3.0.0..........0.0.0
.....0.0.0.0........0.5.0.0........3.0.0.0........0.0.5.0........0.5.0.3
....0.5.3.3.0......0.0.3.3.0......0.4.3.5.0......0.3.3.0.0......0.0.3.4.0
...1.0.0.4.3.1....0.6.0.4.3.3....3.3.3.0.0.1....1.3.4.0.6.0....0.6.0.3.3.1
..2.1.0.3.0.0.1..0.0.0.3.0.0.0..0.0.0.0.3.1.2..1.0.0.3.0.0.0..0.0.0.0.0.0.1

Crossrefs

Sequence in context: A000835 A239028 A335638 * A197853 A087184 A067959

Adjacent sequences: A197988 A197989 A197990 * A197992 A197993 A197994

Keyword

nonn

Author

R. H. Hardin Oct 20 2011

Status

approved