A202958 Number of arrays of n+2 integers in -4..4 with sum zero and adjacent elements differing in absolute value.

36, 268, 1562, 9884, 66208, 447528, 3020170, 20430512, 139027620, 950710524, 6520317018, 44823140280, 308853569150, 2132736199028, 14754220477302, 102231808797944, 709381651755672, 4928801328948764, 34285920139143690

Offset: 1

Author

R. H. Hardin Dec 26 2011

Keywords

• nonn

Comments

Column 4 of A202962

Examples

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

Links

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