4428675

Appears in sequences

• a(n) = 3^n(n^2 - n + 18)/18.at n=12A081909
• G.f.: (1+x+x^2+2*x^5-2*x^10)/(1-3*x^3).at n=43A213933
• Number of ascending runs in {1,...,3}^n.at n=12A229277