A197964 Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 2,6,1,0,1,0,1 for x=0,1,2,3,4,5,6

1, 1, 4, 26, 138, 1523, 26489, 687930, 27990897, 1765820801, 172024403235, 25959739501756

Offset

1,3

Comments

Every 0 is next to 0 2's, every 1 is next to 1 6's, every 2 is next to 2 1's, every 3 is next to 3 0's, every 4 is next to 4 1's, every 5 is next to 5 0's, every 6 is next to 6 1's

Links

Table of n, a(n) for n=1..12.

Example

Some solutions with all values from 0 to 6 for 7X7X7
........0..............2..............0..............2..............2
.......3.0............1.1............3.0............1.1............1.1
......0.5.0..........1.6.1..........3.0.0..........1.6.1..........1.6.1
.....0.0.0.0........0.1.1.0........0.0.5.0........4.1.1.0........0.1.1.0
....1.1.4.1.1......1.1.4.0.0......1.1.0.1.1......1.1.4.3.0......1.1.4.0.3
...1.6.1.1.6.1....1.6.1.3.5.0....1.6.1.1.6.1....1.6.1.0.5.0....1.6.1.0.5.0
..2.1.1.0.1.1.2..0.1.1.0.0.0.0..0.1.1.4.1.1.2..0.1.1.0.0.0.0..0.1.1.0.0.0.0

Crossrefs

Sequence in context: A053906 A359962 A316539 * A100236 A229278 A180226

Adjacent sequences: A197961 A197962 A197963 * A197965 A197966 A197967

Keyword

nonn

Author

R. H. Hardin Oct 19 2011

Status

approved