138949

Appears in sequences

• Triangle read by rows: T(n,k) = number of peakless Motzkin paths of length n containing k U H^j Us for some j>0, where U=(1,1) and H=(1,0) (can be easily expressed using RNA secondary structure terminology).at n=48A097777
• Number of peakless Motzkin paths with no U H...HU's where U=(1,1) and H=(1,0) (can be easily expressed using RNA secondary structure terminology).at n=18A098051
• a(n) = a(n-1) + 2*a(n-2) + a(n-3) - a(n-4).at n=16A101400