A199828 Number of -4..4 arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero

44, 336, 2146, 15708, 118280, 888420, 6715618, 51077518, 390278378, 2993722414, 23038998514, 177794832922, 1375379617514, 10662124449466, 82808224932874, 644200988262616, 5018935818153796, 39154328577073846, 305823285072243150

Offset

1,1

Comments

Column 4 of A199832

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

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

Crossrefs

Sequence in context: A094794 A001689 A306937 * A183633 A200450 A024304

Adjacent sequences: A199825 A199826 A199827 * A199829 A199830 A199831

Keyword

nonn

Author

R. H. Hardin Nov 11 2011

Status

approved