A200180 Number of -7..7 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, 7, 9, 31, 53, 141, 380, 1010, 2152, 5014, 14018, 35542, 78385, 188789, 503051, 1241939, 2859687, 6957672, 17863397, 43991846, 103888178, 253531752, 640390692, 1575397895, 3777406958, 9259136398, 23167497450, 57008137128, 138220165963

Offset

1,2

Comments

Column 7 of A200181

Links

R. H. Hardin, Table of n, a(n) for n = 1..110

Example

Some solutions for n=6
..3....6....7....2....3....4....1....2....6....2....5....2....6....4....5....2
.-1....5....2....3...-1....0....2....3....2....3...-1....0....0....2....6....0
..0....6....3....4....0....1....3....4....3....4....0....1....1....3...-3....1
.-1...-6...-4...-3....1...-2....0...-4...-3...-2....1....2...-1...-2...-2....0
..0...-5...-3...-2....2...-1....1...-3...-2...-1....2...-3....0...-1...-1....1
.-1...-6...-5...-4...-5...-2...-7...-2...-6...-6...-7...-2...-6...-6...-5...-4

Crossrefs

Sequence in context: A309199 A186234 A085903 * A147248 A147186 A131623

Adjacent sequences: A200177 A200178 A200179 * A200181 A200182 A200183

Keyword

nonn

Author

R. H. Hardin Nov 13 2011

Status

approved