34473600domain: NAppears in sequencesTotal number of distorted ancestor-successor pairs in all defective (binary) heaps on n elements.at n=10A324074a(n) = n! * Sum_{k=0..floor(n/3)} k^(n - 3*k)/k!.at n=10A355575E.g.f. A(x) satisfies A(x) = exp(x^2 * (1+x)^2 * A(x)).at n=9A386983