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A166174 Number of nXnXn triangular nonnegative integer arrays with all sums of an element and its neighbors <= 2 0
1, 3, 10, 29, 207, 2052, 23591, 461028, 13080857, 509035046, 29707234283, 2523185644983, 307483024897755, 54719108015588143, 14151178622373819910, 5302079572065910774222 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..15.

EXAMPLE

Some solutions for n=4

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

....0.0......0.0......0.0......0.0......0.0......0.0......0.0......0.0..

...0.0.0....0.0.1....1.0.0....0.0.0....0.1.0....1.0.1....0.0.0....1.0.0.

..0.1.0.1..0.1.0.0..1.0.0.1..0.2.0.0..1.0.0.1..0.0.0.0..2.0.0.2..0.0.0.2

------

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

....0.0......0.0......1.0......2.0......0.1......0.0......0.0......0.0..

...1.0.1....1.0.0....0.0.1....0.0.0....0.0.0....0.0.0....0.1.0....0.0.0.

..1.0.0.1..1.0.0.1..0.0.0.1..0.0.0.2..1.1.0.1..2.0.0.1..0.0.0.0..1.0.0.0

CROSSREFS

Sequence in context: A147062 A293155 A146384 * A006484 A144007 A026960

Adjacent sequences:  A166171 A166172 A166173 * A166175 A166176 A166177

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 09 2009

STATUS

approved

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Last modified January 22 00:08 EST 2022. Contains 350481 sequences. (Running on oeis4.)