

A200175


Number of 2..2 arrays x(0..n1) 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



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
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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



