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

1,1

Comments

Column 4 of A202962

Links

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

Example

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

Crossrefs

Sequence in context: A115223 A135181 A220159 * A187511 A185243 A014136

Adjacent sequences: A202955 A202956 A202957 * A202959 A202960 A202961

Keyword

nonn

Author

R. H. Hardin Dec 26 2011

Status

approved