A201433 Number of zero-sum -2..2 arrays of n elements with first through fourth differences also in -2..2

1, 3, 5, 15, 21, 37, 39, 65, 107, 183, 313, 527, 853, 1459, 2455, 4167, 7051, 11857, 20009, 33993, 57671, 98267, 167457, 285197, 487513, 833647, 1427739, 2448037, 4197785, 7202371, 12370905, 21249671, 36538153, 62845703, 108146777, 186184157

Offset

1,2

Comments

Column 2 of A201439

Links

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

Example

Some solutions for n=10
.-1....2...-1...-2...-1....0....0...-1....2....1....2....1...-1....0...-2....0
.-2....0...-1...-1...-1...-2....2....0....0....0....1...-1....1...-1....0....1
.-2...-1...-1...-1...-1...-2....2....1....0...-1...-1...-1....1...-1....0....0
.-1...-1...-1...-1...-1...-1....1....2....0...-1...-2...-1....0...-1...-1...-1
..0...-1....0...-1...-1....0....0....2....0....0...-2...-1...-1...-1...-1...-1
..1...-1....1....0....0....1...-1....1....0....1...-2...-1...-1...-1....0...-1
..1...-1....1....1....1....2...-2...-1....0....1...-1....0...-1....0....1....0
..1....0....1....2....2....2...-2...-2....0....1....1....1....0....1....1....1
..1....1....1....2....2....1...-1...-2....0....0....2....2....1....2....1....1
..2....2....0....1....0...-1....1....0...-2...-2....2....1....1....2....1....0

Crossrefs

Sequence in context: A070079 A142717 A057742 * A101129 A177916 A128396

Adjacent sequences: A201430 A201431 A201432 * A201434 A201435 A201436

Keyword

nonn

Author

R. H. Hardin Dec 01 2011

Status

approved