A200175 Number of -2..2 arrays x(0..n-1) of n elements with zero sum and no two consecutive declines, no adjacent equal elements, and no element more than one greater than the previous (random base sawtooth pattern)

1, 2, 3, 6, 12, 15, 29, 72, 133, 214, 394, 853, 1782, 3087, 5597, 11777, 24069, 45200, 83805, 167284, 342971, 664695, 1257505, 2476990, 4999659, 9864713, 19023479, 37228518, 74480796, 147868410, 288747975, 565957525, 1124938149, 2237002991

Offset

1,2

Comments

Column 2 of A200181

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

All solutions for n=6
..1....2....1...-1....2....1...-2....0...-1....2....0....0....0....2....0
..0...-2...-1....0....1...-1...-1...-1....0....0....1....1...-2....0....1
..1...-1....0....1....2....0....0....0....1....1....2...-1...-1....1....2
.-1....0....1...-1...-2...-1....1....1....0...-2...-2....0....0...-1...-1
..0....1...-1....0...-1....0....2....2....1...-1...-1....1....1....0....0
.-1....0....0....1...-2....1....0...-2...-1....0....0...-1....2...-2...-2

Crossrefs

Sequence in context: A070926 A226023 A124485 * A286906 A125867 A032727

Adjacent sequences: A200172 A200173 A200174 * A200176 A200177 A200178

Keyword

nonn

Author

R. H. Hardin Nov 13 2011

Status

approved