A199937 - OEIS

A199937

Number of -2..2 arrays x(0..n-1) of n elements with zeroth through n-1st differences all nonzero

4, 12, 36, 104, 302, 868, 2490, 7132, 20424, 58418, 167036, 477412, 1364340, 3898236, 11138194, 31824012, 90926724, 259790792, 742259560, 2120727868, 6059178186, 17311798890, 49461883130, 141318491362, 403763748824

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OFFSET

1,1

COMMENTS

Column 2 of A199943

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Some solutions for n=6

.-2....2....2...-2....1...-2....1...-2...-1....1...-1...-1...-2...-1....2....2

..2...-1...-1....1....2....2...-2....1....1....2....1...-2....2...-2...-1....1

.-1....2...-2...-1....1....1...-1...-2....2...-1...-2....2....1....1....2....2

.-2...-1....1....2....2...-1....1....2....1....2...-1...-1....2....2...-2....1

..2....2....2...-2....1...-2...-2...-1....2...-1....2....1...-1...-2...-1....2

.-2....1...-1...-1...-1....1...-1....1...-1...-2....1...-2....1...-1....1...-1

CROSSREFS

Sequence in context: A291732 A291264 A171849 * A290380 A003212 A156945

Adjacent sequences: A199934 A199935 A199936 * A199938 A199939 A199940

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 12 2011

STATUS

approved