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A200208 Number of -n..n arrays x(0..6) of 7 elements with zero sum and nonzero second and third differences 1
90, 3940, 37226, 187530, 667620, 1910006, 4664818, 10140128, 20184636, 37418930, 65462890, 109237270, 175066404, 271040286, 407440210, 596771596, 854269356, 1198528290, 1651314456, 2238353836, 2990103390, 3941357552, 5132247474 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A200204

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..50

EXAMPLE

Some solutions for n=3

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A013394 A013395 A203733 * A017806 A035740 A017753

Adjacent sequences:  A200205 A200206 A200207 * A200209 A200210 A200211

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 14 2011

STATUS

approved

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Last modified May 20 23:05 EDT 2022. Contains 353886 sequences. (Running on oeis4.)