79174

Appears in sequences

• Number of polyhexes with n hexagons, having reflectional symmetry (see Harary and Read for precise definition).at n=18A002215
• Expansion of 1 - 3*x - sqrt(1 - 6*x + 5*x^2).at n=9A122737
• 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=45A128741
• G.f. A(x) satisfies A(x/A(x)^3) = 1/(1-x).at n=6A145160