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A202957 Number of arrays of n+2 integers in -3..3 with sum zero and adjacent elements differing in absolute value 1
20, 108, 414, 1936, 9872, 47732, 229714, 1134036, 5624396, 27808428, 138043018, 688575460, 3440536326, 17214566036, 86312920760, 433540643300, 2180469363652, 10980201879136, 55360485999044, 279418616308916, 1411643137279198 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A202962

LINKS

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

EXAMPLE

Some solutions for n=5

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

..2...-2....1....3....2....1....3....1...-1...-1...-3....2...-1...-3...-1...-1

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

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

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

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

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

CROSSREFS

Sequence in context: A278642 A135174 A173963 * A232586 A189437 A285698

Adjacent sequences:  A202954 A202955 A202956 * A202958 A202959 A202960

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 26 2011

STATUS

approved

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Last modified December 3 04:22 EST 2021. Contains 349445 sequences. (Running on oeis4.)