A198003 Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 2,5,1,1,1,1,1 for x=0,1,2,3,4,5,6

1, 1, 1, 25, 31, 73, 37487, 151968, 2529733, 1741375327, 89777954615

Offset

1,4

Comments

Every 0 is next to 0 2's, every 1 is next to 1 5'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 1's

Links

Table of n, a(n) for n=1..11.

Example

Some solutions with all values from 0 to 6 for 7X7X7
........0..............0..............0..............0..............2
.......1.0............1.0............1.1............0.1............1.1
......1.5.1..........1.5.1..........2.5.1..........1.5.1..........1.5.0
.....4.1.1.0........4.1.1.0........2.1.1.3........3.1.1.4........4.1.1.3
....1.1.6.1.0......1.1.6.1.0......2.1.6.1.0......0.1.6.1.1......1.1.6.1.1
...1.5.1.1.5.1....1.5.1.1.5.1....1.5.1.1.5.1....1.5.1.1.5.1....0.5.1.1.5.0
..0.1.0.3.1.1.2..2.1.0.3.1.1.2..2.1.1.4.1.1.0..2.1.1.0.0.1.2..0.1.1.0.1.1.0

Crossrefs

Sequence in context: A307283 A184042 A157646 * A039323 A043146 A043926

Adjacent sequences: A198000 A198001 A198002 * A198004 A198005 A198006

Keyword

nonn

Author

R. H. Hardin Oct 20 2011

Status

approved