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A199828 Number of -4..4 arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero 1
44, 336, 2146, 15708, 118280, 888420, 6715618, 51077518, 390278378, 2993722414, 23038998514, 177794832922, 1375379617514, 10662124449466, 82808224932874, 644200988262616, 5018935818153796, 39154328577073846, 305823285072243150 (list; graph; refs; listen; history; text; internal format)
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

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Last modified April 10 11:15 EDT 2021. Contains 342845 sequences. (Running on oeis4.)