A217506 Number of triangular nXnXn arrays of occupancy after each element either stays or moves to some neighbor and with no occupancy greater than 4

1, 10, 342, 44530, 22155653, 42007776880

Offset

1,2

Comments

Column 4 of A217510

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for n=4
.....0........0........3........0........3........2........0........1
....1.0......1.1......0.1......1.0......0.0......0.2......0.1......0.1
...1.0.3....1.0.0....0.1.0....0.3.1....1.1.4....0.1.0....0.2.3....1.0.0
..0.2.3.0..1.2.3.1..0.1.4.0..0.2.3.0..1.0.0.0..0.2.1.2..2.0.2.0..2.2.3.0

Crossrefs

Sequence in context: A029698 A197598 A197982 * A197769 A171583 A060704

Adjacent sequences: A217503 A217504 A217505 * A217507 A217508 A217509

Keyword

nonn

Author

R. H. Hardin Oct 05 2012

Status

approved