326089

Appears in sequences

• Number of permutations of {1,...,n} avoiding adjacent step pattern up, up, down, up, up.at n=9A177532
• Number of dispersed Dyck paths of length n (i.e., of Motzkin paths of length n with no (1,0)-steps at positive heights) having no base pyramids. A base pyramid is a factor of the form U^j D^j (j>0), starting at the horizontal axis. Here U=(1,1) and D=(1,-1).at n=25A191393