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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
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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 13 2011
STATUS
approved