A197546 Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 0,1,2,3,4,5,6 for x=0,1,2,3,4,5,6

1, 4, 7, 13, 40, 264, 888, 2335, 22885, 134738, 1291220

Offset

1,2

Comments

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

Links

Table of n, a(n) for n=1..11.

Example

Some solutions for 5X5X5
......0..........0..........0..........0..........0..........0..........0
.....2.2........1.1........2.2........1.1........1.1........2.2........2.2
....2.0.2......0.2.2......2.0.2......2.2.0......0.2.0......2.0.2......2.1.2
...0.2.2.0....2.1.2.1....1.2.2.1....1.2.1.2....1.2.2.1....1.2.2.0....2.0.1.2
..1.1.0.1.1..2.2.1.0.1..0.1.0.1.0..1.0.1.2.2..0.1.0.1.0..0.1.0.1.1..0.2.2.2.0

Crossrefs

Sequence in context: A293342 A298346 A122552 * A074862 A101064 A243707

Adjacent sequences: A197543 A197544 A197545 * A197547 A197548 A197549

Keyword

nonn

Author

R. H. Hardin Oct 16 2011

Status

approved