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A200556 Number of -n..n arrays x(0..5) of 6 elements with zero sum and nonzero second differences 1
72, 1240, 7254, 26850, 75792, 178834, 372150, 705270, 1242888, 2067650, 3281874, 5009232, 7397868, 10621792, 14882672, 20413220, 27478160, 36376230, 47443518, 61054528, 77624122, 97610834, 121518006, 149895400, 183343046, 222512226 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A200553

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +a(n-2) +a(n-3) -2*a(n-4) -a(n-6) -a(n-7) -a(n-8) +3*a(n-9) +3*a(n-10) -a(n-11) -a(n-12) -a(n-13) -2*a(n-15) +a(n-16) +a(n-17) +a(n-18) -a(n-19)

EXAMPLE

Some solutions for n=3

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

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

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

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

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

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

CROSSREFS

Sequence in context: A168194 A249713 A269074 * A239423 A128800 A008391

Adjacent sequences:  A200553 A200554 A200555 * A200557 A200558 A200559

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 19 2011

STATUS

approved

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Last modified April 6 07:02 EDT 2020. Contains 333267 sequences. (Running on oeis4.)