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A200167 Number of -n..n arrays x(0..3) of 4 elements with nonzero sum and with zero through 3 differences all nonzero 1
0, 76, 576, 2256, 6160, 13888, 27160, 48380, 80096, 125412, 187552, 270688, 378512, 515980, 687836, 899548, 1156496, 1465440, 1832040, 2263800, 2767676, 3351476, 4022752, 4790848, 5663388, 6650440, 7761148, 9005676, 10393744, 11937276 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A200165

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-2) +2*a(n-3) -a(n-4) -3*a(n-5) -a(n-6) +a(n-9) +3*a(n-10) +a(n-11) -2*a(n-12) -2*a(n-13) +a(n-15)

EXAMPLE

Some solutions for n=5

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

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

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

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

CROSSREFS

Sequence in context: A262790 A184680 A129626 * A178262 A253411 A185481

Adjacent sequences:  A200164 A200165 A200166 * A200168 A200169 A200170

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 13 2011

STATUS

approved

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Last modified October 20 08:05 EDT 2019. Contains 328252 sequences. (Running on oeis4.)