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A202515 Number of zero-sum -n..n arrays of 7 elements with first through third differences also in -n..n 1

%I

%S 7,109,747,3285,10799,29295,68781,145389,282771,514931,887733,1463059,

%T 2320007,3560523,5310021,7724815,10991973,15338839,21031377,28387187,

%U 37770899,49610615,64391723,82677087,105095693,132370313,165301879

%N Number of zero-sum -n..n arrays of 7 elements with first through third differences also in -n..n

%C Row 7 of A202511

%H R. H. Hardin, <a href="/A202515/b202515.txt">Table of n, a(n) for n = 1..70</a>

%e Some solutions for n=7

%e ..7....4...-2...-2...-4...-7...-2...-2....6...-3....5....2...-2....4...-4...-1

%e ..0....1....3...-5...-1...-2....1...-2....4...-5....4....7...-3...-1....3....2

%e .-5....0....1...-3...-1...-2....5...-4....0...-6....1....6...-4....0....6....3

%e .-7...-2...-3....2...-2....0....5...-5....0...-1...-3....1...-2....2....3...-1

%e .-3...-3...-3....3....2....3....0....0....0....5...-3...-2....1....0...-2...-3

%e ..1...-1....1....4....4....6...-3....6...-4....6...-1...-7....5...-1...-2...-1

%e ..7....1....3....1....2....2...-6....7...-6....4...-3...-7....5...-4...-4....1

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 20 2011

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Last modified July 7 16:01 EDT 2020. Contains 335496 sequences. (Running on oeis4.)