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

Author

R. H. Hardin Nov 13 2011

Keywords

• nonn

Comments

Column 7 of A200181

Examples

			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
		

Links

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