125904domain: NAppears in sequencesNumber of n-node rooted trees of height at most 3.at n=22A001383a(n) is the number of n-tosses having a run of 3 or more heads or a run of 3 or more tails for a fair coin (i.e., probability is a(n)/2^n).at n=16A167821Convolution of Leonardo numbers with Jacobsthal numbers.at n=16A377728