115258domain: NAppears in sequencesAlkane (or paraffin) numbers l(9,n).at n=20A018210Expansion of 1/(1 - x - Sum_{k>=2} floor(1/omega(k))*x^k), where omega(k) is the number of distinct prime factors (A001221).at n=18A280543Number of n-element subsets of [n+6] having an even sum.at n=20A282082