24878domain: NAppears in sequencesa(n) = Sum_{k=0..n} f(k)*f(n-k) where f(k) = A002124(k).at n=37A002125a(n) = Sum_{d divides n} (-1)^(n-d)*Stirling1(n,d).at n=7A096308Left border of triangle A137629.at n=33A137631Number of terms of height n in Recamán's sequence A005132.at n=17A269830