A197969 Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 2,0,1,0,1,0,0 for x=0,1,2,3,4,5,6

1, 4, 13, 70, 623, 8251, 175624, 6025175, 328086179, 28548905232

Offset

1,2

Comments

Every 0 is next to 0 2's, every 1 is next to 1 0'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 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..............2..............0
.......1.1............0.0............0.0............1.1............0.0
......1.4.1..........0.6.0..........0.6.0..........0.3.0..........0.6.0
.....3.0.0.3........0.0.0.3........3.0.0.3........0.5.0.3........3.0.0.0
....0.0.0.0.0......3.0.5.0.1......0.3.5.0.1......0.0.0.0.1......1.0.0.5.0
...0.6.0.5.3.1....1.0.0.3.4.1....1.3.0.0.4.1....0.6.0.0.4.1....1.4.0.0.3.1
..0.0.0.0.0.1.2..2.1.3.0.1.1.0..2.1.0.3.1.1.0..0.0.0.3.1.1.0..0.1.1.3.0.1.2

Crossrefs

Sequence in context: A009239 A042277 A125617 * A121452 A249165 A304598

Adjacent sequences: A197966 A197967 A197968 * A197970 A197971 A197972

Keyword

nonn

Author

R. H. Hardin Oct 19 2011

Status

approved