A198088 Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 4,4,2,0,1,2,0 for x=0,1,2,3,4,5,6

1, 2, 11, 74, 976, 21825, 872834, 59303832, 7042717250, 1444475469020

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 0's, every 4 is next to 4 1's, every 5 is next to 5 2'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..............1..............0..............0..............1
.......0.0............4.1............0.0............2.2............4.1
......0.6.0..........1.1.0..........0.6.0..........2.0.2..........1.1.0
.....3.0.0.0........2.2.3.0........3.0.0.0........0.2.5.2........3.0.2.2
....1.0.2.2.2......2.0.2.0.0......1.0.2.2.2......0.0.2.2.1......0.0.2.5.2
...4.1.2.5.0.2....2.5.2.0.6.0....4.1.2.0.5.2....0.6.0.3.1.4....0.6.0.2.0.2
..1.1.0.2.2.2.0..0.2.2.0.0.0.0..1.1.0.2.2.2.0..0.0.0.0.0.1.1..0.0.0.0.2.2.0

Crossrefs

Sequence in context: A158265 A321387 A309146 * A112894 A220878 A049363

Adjacent sequences: A198085 A198086 A198087 * A198089 A198090 A198091

Keyword

nonn

Author

R. H. Hardin Oct 21 2011

Status

approved