935184domain: NAppears in sequencesa(n) = 3*a(n-1) - a(n-3), with a(0) = 3, a(1) = 3, and a(2) = 9.at n=13A215885The number of binary heaps on n elements whose breadth-first search reading word avoids 231.at n=17A246747Shifts 3 places left under MNL transform.at n=10A275594