A202957 Number of arrays of n+2 integers in -3..3 with sum zero and adjacent elements differing in absolute value.

20, 108, 414, 1936, 9872, 47732, 229714, 1134036, 5624396, 27808428, 138043018, 688575460, 3440536326, 17214566036, 86312920760, 433540643300, 2180469363652, 10980201879136, 55360485999044, 279418616308916, 1411643137279198

Offset: 1

Author

R. H. Hardin Dec 26 2011

Keywords

• nonn

Comments

Column 3 of A202962

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210