2674426

Appears in sequences

• Symmetrical dissections of an n-gon.at n=25A000063
• G.f.: A(x) = (x-2*x^2-2*x^3-(1+x)*sqrt(1-4*x^2)+sqrt(1-4*x^6))/(2*x^2).at n=26A063786
• a(n) = Catalan(n) - n.at n=14A246604
• A246604 (Catalan(n)-n) with initial terms 1,0,0,2 changed to 1,1,1,3.at n=14A289615
• A246604 (Catalan(n)-n) with initial terms 1,0,0,2,10 changed to 1,1,1,2,11.at n=14A289616