A201434 Number of zero-sum -3..3 arrays of n elements with first through fourth differences also in -3..3

1, 3, 15, 29, 55, 167, 295, 647, 1427, 3399, 6987, 15915, 35035, 78815, 175659, 401885, 907063, 2070241, 4703563, 10756853, 24527921, 56167839, 128565473, 295006361, 677007927, 1556684111, 3580113745, 8243974707, 18993055553, 43795271957

Offset

1,2

Comments

Column 3 of A201439

Links

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

Example

Some solutions for n=10
.-1...-3....3...-2...-1...-3....2....3....0....2...-3....0....1...-2....3...-1
.-1....0....0....0....0....0....2....1....0...-1...-1...-2....1....0....2....2
..1....0...-2....0....2....1....3...-2...-2...-1....1...-3....2....0....1....2
..2....0...-2...-1....3....1....3...-3...-3...-1....2...-2....2....0...-1....0
..2....1...-2...-2....2....0....1...-2...-3...-2....2...-1....2....0...-2...-2
..0....3...-2...-1....0....0...-2...-1...-1...-2....2....1....1....1...-2...-2
.-2....3...-1....1...-2....0...-3....0....1...-1....1....3...-1....2...-2....0
.-2....1....1....2...-3....1...-2....0....2....1...-1....3...-3....2...-1....1
..0...-2....3....2...-2....1...-1....1....3....3...-2....1...-3....0....1....1
..1...-3....2....1....1...-1...-3....3....3....2...-1....0...-2...-3....1...-1

Crossrefs

Sequence in context: A067144 A018784 A147344 * A308385 A202506 A053519

Adjacent sequences: A201431 A201432 A201433 * A201435 A201436 A201437

Keyword

nonn

Author

R. H. Hardin Dec 01 2011

Status

approved