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A201867 Number of zero-sum -2..2 arrays of n elements with first and second differences also in -2..2 1
1, 3, 5, 19, 45, 129, 345, 1031, 2969, 8803, 25791, 76285, 225047, 667807, 1984599, 5918017, 17672419, 52880691, 158447783, 475463579, 1428412619, 4296219727, 12934516047, 38978330199, 117561661847, 354857238103, 1071910795169 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 2 of A201873
LINKS
Wolfdieter Lang, On Generating functions of Diagonals Sequences of Sheffer and Riordan Number Triangles, arXiv:1708.01421 [math.NT], August 2017.
EXAMPLE
Some solutions for n=10
.-1....1...-1....2...-1...-1....1....2....2....0...-2...-2...-2....2...-2...-2
.-1....2...-2....2....0...-1....1....2....2...-1...-2...-2...-1....1....0...-2
..1....1...-1....2...-1...-1....0....2....1....0...-1....0....0...-1....0....0
..1....0....0....1...-1...-2...-1....0....1....2....0....2...-1...-2....1....0
..0...-1....1....0...-1...-1...-1...-1...-1....2....0....2...-1...-2....1....0
.-1...-1....0....0....0....0....0....0...-1....1....0....0...-1....0....1....0
..0....0....1...-2....0....1....1...-1....0....0....1...-1....1....1....1....0
..0...-1....1...-2....1....2....0...-1....0...-2....1....0....2....0...-1....1
..0....0....1...-2....2....2...-1...-1...-2...-2....1....0....1....1...-1....2
..1...-1....0...-1....1....1....0...-2...-2....0....2....1....2....0....0....1
CROSSREFS
Sequence in context: A218373 A034511 A133603 * A148534 A148535 A148536
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 06 2011
STATUS
approved

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Last modified September 29 23:48 EDT 2023. Contains 365781 sequences. (Running on oeis4.)