A197934 Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 3,4,0,2,0,0,0 for x=0,1,2,3,4,5,6

1, 4, 15, 154, 2694, 118229, 11056555, 1981194934, 756494696303, 582372249330804

Offset

1,2

Comments

Every 0 is next to 0 3's, every 1 is next to 1 4's, every 2 is next to 2 0's, every 3 is next to 3 2's, every 4 is next to 4 0'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
........2..............0..............0..............0..............0
.......0.0............0.0............4.0............0.0............4.0
......0.6.0..........2.0.0..........0.0.0..........0.0.2..........0.0.2
.....1.0.0.0........3.2.5.0........0.0.6.0........0.5.2.3........0.5.2.3
....0.4.0.5.0......1.2.0.0.4......0.5.0.0.0......0.0.0.2.1......0.0.0.2.1
...0.0.1.2.0.0....0.4.0.6.0.0....4.0.2.2.4.0....0.6.0.0.4.0....0.6.0.0.4.0
..2.0.2.3.2.0.0..2.0.0.0.0.0.0..0.0.2.3.1.0.0..2.0.0.4.0.0.0..2.0.0.4.0.0.0

Crossrefs

Sequence in context: A246791 A037447 A197753 * A137654 A349402 A277509

Adjacent sequences: A197931 A197932 A197933 * A197935 A197936 A197937

Keyword

nonn

Author

R. H. Hardin Oct 19 2011

Status

approved