A199841 Number of -2..2 arrays x(0..n-1) of n elements with zero sum and no element more than one greater than the previous.
1, 3, 8, 23, 66, 192, 575, 1739, 5307, 16304, 50381, 156408, 487398, 1523663, 4776107, 15006513, 47247134, 149023605, 470794024, 1489462276, 4718330397, 14964219411, 47509518289, 150982994162, 480243297965, 1528796563830, 4870415108094
Offset: 1
Keywords
Examples
Some solutions for n=6 ..2...-1....2....1....2....1....1....1....1...-1....2....1....1....1....1....1 ..1....0....0...-1....1....1....2....1...-1....0....2....1....1....2....0....0 .-2....1....1....0....2....0....0....0...-1....1...-2....1....1....1....0...-1 .-1....0...-2....0...-1...-1....0....1....0....1...-1....0...-1...-1....0....0 ..0....1...-1....0...-2....0...-2...-2....0....1...-1...-1....0...-1....1....0 ..0...-1....0....0...-2...-1...-1...-1....1...-2....0...-2...-2...-2...-2....0
Links
- R. H. Hardin, Table of n, a(n) for n = 1..200
Comments