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A200457 Number of -n..n arrays x(0..4) of 5 elements with zero sum and nonzero first and second differences 1
6, 144, 728, 2334, 5720, 12002, 22276, 38174, 61290, 93704, 137374, 194964, 268842, 362092, 477620, 618954, 789324, 992970, 1233412, 1515270, 1842742, 2220844, 2654034, 3148080, 3707758, 4339192, 5047836, 5840186, 6721964, 7700510, 8781768 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A200454

LINKS

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

FORMULA

Empirical: a(n) = -a(n-1) +a(n-3) +2*a(n-4) +2*a(n-5) +a(n-6) -a(n-8) -a(n-9) -a(n-10) -2*a(n-11) -2*a(n-12) -2*a(n-13) -a(n-14) +a(n-15) +2*a(n-16) +2*a(n-17) +2*a(n-18) +a(n-19) +a(n-20) +a(n-21) -a(n-23) -2*a(n-24) -2*a(n-25) -a(n-26) +a(n-28) +a(n-29)

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A111839 A037049 A196811 * A128785 A197178 A208230

Adjacent sequences:  A200454 A200455 A200456 * A200458 A200459 A200460

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 18 2011

STATUS

approved

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Last modified October 27 10:47 EDT 2021. Contains 348274 sequences. (Running on oeis4.)