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A190070 Number of arrangements of n+1 nonzero numbers x(i) in -8..8 with the sum of div(x(i),x(i+1)), where div(a,b)=a/b produces the integer quotient implying a nonnegative remainder, equal to zero.

%I A190070 #7 Jul 22 2025 12:00:41
%S A190070 56,536,6946,92478,1291797,18951546,282859251,4232955454,63898862902,
%T A190070 972408511316,14859125421285,227805216299376,3504714306481893,
%U A190070 54079878634478640,836480995724826396,12965711458798193610
%N A190070 Number of arrangements of n+1 nonzero numbers x(i) in -8..8 with the sum of div(x(i),x(i+1)), where div(a,b)=a/b produces the integer quotient implying a nonnegative remainder, equal to zero.
%C A190070 Column 8 of A190071
%H A190070 R. H. Hardin, <a href="/A190070/b190070.txt">Table of n, a(n) for n = 1..76</a>
%e A190070 Some solutions for n=4
%e A190070 ..7....8....8....5...-3...-6...-2...-2...-7....2....3...-7...-8....5....8...-3
%e A190070 ..6....3....2....8...-8....4...-3....6....8...-5...-7...-6....8....2....8....5
%e A190070 .-2....5...-4....8....6....3....6...-8....8...-3....3....8....8...-6...-4...-3
%e A190070 .-3...-8....1...-4....5....3....6....7....5....5....1....5....7....4....6...-4
%e A190070 .-6....7...-8...-7....8....6...-4....2...-4...-3...-7...-2...-7...-6....3...-6
%K A190070 nonn
%O A190070 1,1
%A A190070 _R. H. Hardin_ May 04 2011