101340domain: NAppears in sequencesSeries-parallel numbers.at n=4A000527Number of 2n-bead black-white reversible complementable necklaces with n black beads.at n=13A006840Triangle of series-parallel numbers.at n=40A036654Numbers n such that there is both a square and a triangular number strictly between n^3 and n^3+n.at n=2A246042