30820

Appears in sequences

• Number of (w,x,y,z) with all terms in {1,...,n} and |x-y| = w + |y-z|.at n=40A212683
• G.f. = Phi^3*F^3, where Phi = g.f. for A028930, F = g.f. for A028959.at n=15A328534
• Number of strictly-convex unit-sided polygons with all internal angles equal to a multiple of Pi/n, ignoring rotational and reflectional copies.at n=19A361635