A207157 Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 3,3,2,2,0,2,0 for x=0,1,2,3,4,5,6

1, 2, 8, 38, 488, 7274, 207870, 10264080, 821786528, 114065335365

Offset

1,2

Comments

Every 0 is next to 0 3's, every 1 is next to 1 3's, every 2 is next to 2 2's, every 3 is next to 3 2's, every 4 is next to 4 0's, every 5 is next to 5 2'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..............2..............0..............0..............0
.......0.0............2.2............2.2............2.2............0.0
......0.6.0..........3.1.0..........2.5.2..........2.5.2..........0.6.0
.....0.0.0.4........2.2.0.4........0.2.0.2........2.5.2.0........4.0.0.0
....2.2.2.0.0......2.0.2.0.0......0.0.2.2.3......3.2.2.0.0......0.0.2.2.2
...2.5.5.2.1.2....2.5.2.0.6.0....0.6.0.0.1.2....2.1.0.0.6.0....2.1.2.0.5.2
..0.2.2.2.3.2.2..0.2.2.0.0.0.0..0.0.0.4.0.2.2..2.2.0.4.0.0.0..2.2.3.2.2.2.0

Crossrefs

Sequence in context: A060389 A318917 A203122 * A198049 A198092 A207162

Adjacent sequences: A207154 A207155 A207156 * A207158 A207159 A207160

Keyword

nonn

Author

R. H. Hardin Feb 15 2012

Status

approved