122214domain: NAppears in sequencesNumber of nonnegative integer arrays of length 2n+6 with new values 0 upwards introduced in order, no three adjacent elements all unequal, and containing the value n+1.at n=13A211851Number of vertex cuts in the n-helm graph.at n=7A362518Expansion of (1+x+x^2) / (1-x-3*x^2).at n=14A384614