87784domain: NAppears in sequencesa(n) = Sum_{k=0..n} abs(Stirling1(n+1,k+1))*Stirling2(n+1,k+1)*k!.at n=5A192563Poly-Cauchy numbers of the second kind -hat c_5^(-n).at n=4A223908a(n) = a(n-1) + a(n-2) + 2 a(floor(n/2)) + 3 a(floor(n/3)) + ... + n a(floor(n/n)), where a(0) = 1, a(1) = 2, a(2) = 3.at n=17A298370