A197992 Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 2,3,2,1,0,0,0 for x=0,1,2,3,4,5,6

1, 2, 16, 78, 1557, 58327, 3432134, 482064953, 129436138615, 67796772002632

Offset

1,2

Comments

Every 0 is next to 0 2's, every 1 is next to 1 3's, every 2 is next to 2 2's, every 3 is next to 3 1'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
........0..............0..............0..............0..............0
.......0.0............0.0............0.0............0.4............0.0
......0.0.0..........0.6.0..........4.0.0..........4.0.0..........0.0.0
.....0.0.6.0........4.0.0.0........0.0.6.0........0.0.6.0........0.5.4.0
....0.0.0.0.1......0.0.5.1.1......0.5.0.0.1......4.0.0.0.1......0.0.0.1.1
...4.0.5.1.3.2....0.6.0.0.3.2....1.1.0.1.3.2....0.0.5.1.3.2....0.0.6.0.3.2
..0.0.0.0.1.2.2..0.0.0.0.1.2.2..0.3.1.0.1.2.2..0.4.0.0.1.2.2..0.0.0.0.1.2.2

Crossrefs

Sequence in context: A207723 A208835 A208683 * A265173 A264573 A225959

Adjacent sequences: A197989 A197990 A197991 * A197993 A197994 A197995

Keyword

nonn

Author

R. H. Hardin Oct 20 2011

Status

approved