206368domain: NAppears in sequencesNumber of n-covers of an unlabeled 3-set.at n=20A005745a(n) = Sum_{k=0..5} binomial(n,k).at n=31A006261a(n) = Sum_{i=0..n} binomial(2^n-1, i).at n=5A046855An Alexander sequence for the knot 8_5.at n=19A099846a(n) = Sum_{k=0..n} binomial(6*n+1,k).at n=5A385497