A195954 Number of nXnXn 0..6 triangular arrays with each element equal to the number of its neighbors unequal to itself

1, 4, 4, 6, 13, 14, 38, 37, 108, 563, 3086, 5837

Offset

1,2

Links

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

Example

Some solutions for n=10
...........2....................2....................2
..........3.4..................3.3..................3.3
.........3.6.2................4.6.2................4.6.2
........2.2.2.2..............2.2.2.2..............2.2.2.2
.......4.2.2.6.3............3.2.2.5.4............3.2.2.5.3
......3.5.2.4.4.3..........3.6.2.5.6.2..........3.5.2.5.4.3
.....3.5.2.2.4.6.2........2.2.2.2.2.2.2........2.5.2.2.4.4.2
....2.2.2.2.2.2.2.2......3.2.2.5.2.2.5.4......2.2.2.2.2.2.2.2
...3.2.2.5.5.2.2.6.4....3.6.2.5.6.2.5.6.3....3.6.2.5.5.2.2.6.4
..2.3.2.3.3.4.2.3.3.2..2.4.2.2.4.2.2.4.3.2..2.3.2.2.3.3.2.3.3.2

Crossrefs

Sequence in context: A054223 A160643 A078321 * A278532 A352845 A128089

Adjacent sequences: A195951 A195952 A195953 * A195955 A195956 A195957

Keyword

nonn

Author

R. H. Hardin Sep 25 2011

Status

approved