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A217228 Number of triangular nXnXn arrays of occupancy after each element moves to some neighbor but without 2-loops and with no occupancy greater than 2. 0
0, 1, 26, 1755, 321848, 178829423 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 2 of A217232

LINKS

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

EXAMPLE

Some solutions for n=4

.....1........1........1........0........0........0........0........0

....2.1......2.2......2.2......1.2......1.1......1.1......1.2......2.0

...2.0.1....1.1.2....2.1.0....1.1.2....1.2.1....1.1.2....1.1.1....1.1.2

..0.1.1.1..0.1.0.0..1.0.1.0..1.2.0.0..1.0.2.1..1.1.1.1..1.2.1.0..0.1.2.1

CROSSREFS

Sequence in context: A282884 A080163 A300578 * A005644 A123537 A220503

Adjacent sequences:  A217225 A217226 A217227 * A217229 A217230 A217231

KEYWORD

nonn,hard,more

AUTHOR

R. H. Hardin Sep 28 2012

STATUS

approved

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Last modified January 18 03:02 EST 2022. Contains 350410 sequences. (Running on oeis4.)