A197923 Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 4,2,1,1,1,1,0 for x=0,1,2,3,4,5,6

1, 4, 22, 177, 5738, 160173, 13351462, 1939178408, 480290035535

Offset

1,2

Comments

Every 0 is next to 0 4's, every 1 is next to 1 2's, every 2 is next to 2 1's, every 3 is next to 3 1's, every 4 is next to 4 1's, every 5 is next to 5 1'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..............2..............0..............1..............0
.......0.0............1.1............0.0............1.2............0.0
......0.6.0..........0.5.1..........0.6.0..........1.4.2..........0.6.0
.....0.0.0.2........2.1.1.2........2.0.0.2........2.1.1.1........2.0.0.0
....2.1.3.1.1......1.3.1.0.0......1.1.3.1.1......0.0.3.5.1......1.1.3.1.2
...0.1.4.1.5.1....1.4.2.0.6.0....1.4.1.5.1.0....0.6.0.1.1.2....1.5.1.4.1.0
..0.0.1.2.0.1.2..2.1.1.0.0.0.0..1.2.2.1.1.2.0..0.0.0.2.1.0.0..2.1.0.2.1.0.0

Crossrefs

Sequence in context: A379039 A340332 A207654 * A294343 A259842 A125863

Adjacent sequences: A197920 A197921 A197922 * A197924 A197925 A197926

Keyword

nonn

Author

R. H. Hardin Oct 19 2011

Status

approved