242640

Appears in sequences

• Expansion of e.g.f. (1-2*x)/(1-3*x-x^2+2*x^3).at n=6A052669
• Indices n such that A272464(n)=1.at n=28A272465
• Triangle read by rows: T(n,k) is the number of linear chord diagrams on 2n vertices with one marked chord such that exactly k of the remaining n-1 chords contain the marked chord.at n=33A336600