A202761 Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 4,0,0,1,2,0,0 for x=0,1,2,3,4,5,6

1, 7, 18, 146, 2128, 28764, 1064140, 59594272, 4526156600

Offset

1,2

Comments

Every 0 is next to 0 4's, every 1 is next to 1 0's, every 2 is next to 2 0's, every 3 is next to 3 1's, every 4 is next to 4 2'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..9.

Example

Some solutions with all values from 0 to 6 for 7X7X7
........0..............0..............0..............0..............0
.......0.0............2.0............1.1............2.0............1.1
......0.6.0..........4.2.2..........2.3.1..........4.2.2..........1.3.2
.....0.0.0.2........2.2.0.2........0.0.0.2........2.2.0.2........2.0.0.0
....2.0.5.2.4......0.0.5.0.1......0.0.5.0.2......0.0.5.0.1......2.0.5.0.0
...1.3.0.0.2.2....0.6.0.0.3.1....0.6.0.2.2.0....0.6.0.0.3.1....0.2.2.0.6.0
..0.1.1.2.2.0.0..2.0.0.0.2.1.0..2.0.0.2.4.2.0..0.0.0.0.2.1.0..0.2.4.2.0.0.0

Crossrefs

Sequence in context: A197656 A205078 A198023 * A196219 A219772 A219290

Adjacent sequences: A202758 A202759 A202760 * A202762 A202763 A202764

Keyword

nonn

Author

R. H. Hardin Dec 23 2011

Status

approved