35063domain: NAppears in sequencesRelated to number of irreducible stick-cutting problems.at n=20A022541Number of unlabeled 3-element intersecting families (with distinct sets) of an n-element set.at n=13A055485Semiprimes in A054552.at n=32A113690Number of n X 2 binary arrays with each 1 adjacent to exactly two 0's.at n=13A183330