A200190 Number of -6..6 arrays x(0..n-1) of n elements with zero sum, adjacent elements differing by more than one, and elements alternately increasing and decreasing

1, 12, 66, 426, 2794, 18838, 127800, 881008, 6081086, 42452472, 296258332, 2085263400, 14662923954, 103810065802, 734016517080, 5219300699654, 37060739113354, 264413563521598, 1883784631395118, 13476226807283384

Offset

1,2

Comments

Column 6 of A200192

Links

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

Example

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

Crossrefs

Sequence in context: A036399 A003200 A353291 * A270251 A165107 A032167

Adjacent sequences: A200187 A200188 A200189 * A200191 A200192 A200193

Keyword

nonn

Author

R. H. Hardin Nov 14 2011

Status

approved