155180domain: NAppears in sequencesG.f. satisfies: A(x) = 1/(1 - x - x*{d/dx x^2*A'(x)/A(x)}).at n=6A183607Number of arrangements of 4 nonzero numbers x(i) in -n..n with the sum of trunc(x(i)/x(i+1)) equal to zero.at n=16A189547