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A217229
Number of triangular nXnXn arrays of occupancy after each element moves to some neighbor but without 2-loops and with no occupancy greater than 3.
0
0, 1, 47, 4830, 1686393, 2096316167
OFFSET
1,3
COMMENTS
Column 3 of A217232
EXAMPLE
Some solutions for n=4
.....0........0........0........1........0........0........0........1
....2.0......0.2......0.1......1.1......2.1......1.1......2.2......0.1
...1.1.2....2.1.1....0.3.2....2.0.1....0.3.1....1.1.2....1.1.1....1.2.1
..0.0.3.1..0.1.3.0..0.2.2.0..0.2.2.0..0.2.0.1..0.1.2.1..0.2.0.1..1.0.2.1
CROSSREFS
Sequence in context: A104069 A334180 A194617 * A217230 A217231 A141797
KEYWORD
nonn,hard,more
AUTHOR
R. H. Hardin Sep 28 2012
STATUS
approved