742768

Appears in sequences

• Symmetrical dissections of an n-gon.at n=23A000063
• Expansion of (sqrt(1-4x^2) - sqrt(1-4x))/(2x).at n=13A000912
• Dirichlet convolution of Moebius function mu(n) (A008683) with Catalan numbers (A000108).at n=13A034742