342738

Appears in sequences

• Number of polyhexes with n hexagons, having reflectional symmetry (see Harary and Read for precise definition).at n=20A002215
• Catafusenes (see reference for precise definition).at n=20A044044
• Number of fusenes with 23 hexagons, C_(2v) symmetry and containing n carbon atoms.at n=29A122097
• Expansion of 1 - 3*x - sqrt(1 - 6*x + 5*x^2).at n=10A122737
• Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n and having k returns to the x-axis (1 <= k <= n).at n=55A128741