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A217241 Number of triangular nXnXn arrays of occupancy after each element moves to some neighbor and with no occupancy greater than 3. 0
0, 7, 161, 17957, 6839199, 9594137076 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A217245

LINKS

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

EXAMPLE

Some solutions for n=4

.....0........0........1........1........2........1........2........1

....1.1......2.3......0.3......0.2......2.0......0.1......1.1......1.1

...0.2.1....1.1.1....2.0.1....0.2.1....1.0.0....2.2.1....2.3.1....2.0.1

..0.3.0.2..0.0.0.2..1.0.0.2..2.1.0.1..0.2.1.2..0.2.1.0..0.0.0.0..1.2.0.1

CROSSREFS

Sequence in context: A214350 A208263 A160454 * A317727 A142163 A201179

Adjacent sequences:  A217238 A217239 A217240 * A217242 A217243 A217244

KEYWORD

nonn,hard,more

AUTHOR

R. H. Hardin Sep 28 2012

STATUS

approved

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Last modified October 21 14:42 EDT 2021. Contains 348155 sequences. (Running on oeis4.)