188762domain: NAppears in sequencesNumber of nondecreasing integer sequences of length 17 with sum zero and sum of absolute values 2n.at n=18A158151G.f. satisfies: A(x) = Sum_{n>=1} (1 + x^n)/x^n * A(x)^(2*n), where A(0)=0 and A'(0)=1.at n=8A268297