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A202966 Number of arrays of 6 integers in -n..n with sum zero and adjacent elements differing in absolute value 1
0, 200, 1936, 9884, 33736, 90604, 207184, 421620, 785504, 1366876, 2251016, 3543320, 5371856, 7888384, 11270788, 15726488, 21492408, 28838244, 38069472, 49527504, 63592532, 80687412, 101276728, 125870512, 155027684, 189355324 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A202962

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) -3*a(n-4) +a(n-5) +a(n-6) +a(n-9) +a(n-10) -3*a(n-11) +2*a(n-14) -a(n-15)

EXAMPLE

Some solutions for n=5

.-2....4....2...-1....3....2...-4...-4....2...-1....2...-5....3...-3...-4....1

..1....1....5....3...-4....0....0...-2....4...-2....4....3....4...-5....5...-2

..5....2...-3...-4...-5...-1....4....5...-2...-3...-2...-2...-1...-2....4....5

..3...-3....0....1....0....0....3....2...-5...-1...-3....3...-5....4....2....2

.-5....1...-4....3....4...-1...-1...-4....0....3...-1....0....0....5...-5...-4

.-2...-5....0...-2....2....0...-2....3....1....4....0....1...-1....1...-2...-2

CROSSREFS

Sequence in context: A258921 A258918 A129641 * A218846 A219425 A341545

Adjacent sequences:  A202963 A202964 A202965 * A202967 A202968 A202969

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 26 2011

STATUS

approved

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Last modified November 29 21:32 EST 2021. Contains 349416 sequences. (Running on oeis4.)