1/4 the number of arrangements of n+1 nonzero numbers x(i) in -n..n with the sum of sign(x(i))*(|x(i)| mod x(i+1)) equal to zero.

A189943

1/4 the number of arrangements of n+1 nonzero numbers x(i) in -n..n with the sum of sign(x(i))*(|x(i)| mod x(i+1)) equal to zero.

Terms

    a(0) =1a(1) =8a(2) =63a(3) =1246a(4) =31284a(5) =839968a(6) =26586582a(7) =1012894742a(8) =43952718714

External references