A199894 - OEIS

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A199894

Number of -4..4 arrays x(0..n-1) of n elements with zero sum, and adjacent elements not both strictly positive and not both strictly negative

1, 9, 37, 209, 1043, 5725, 30199, 164993, 890299, 4877477, 26632013, 146499083, 805700567, 4449304857, 24590147861, 136249639279, 755738351775, 4199211521573, 23357174342185, 130088542750275, 725223072283995

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Column 4 of A199898

LINKS

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

EXAMPLE

Some solutions for n=6

.-2....1....0...-2....3....3....1....3...-2....0....3...-1....1....2....4....1

..3....0....4....0....0...-3...-1....0....2...-2....0....0...-1...-3...-2...-1

..0....0...-4....0...-2....0....1...-4...-1....0....0...-1....4....3....1....4