26529

Appears in sequences

• Number of compositions of n when each even part can be of two kinds.at n=13A105476
• Expansion of e.g.f. sech(x)/(1-x).at n=8A119884
• a(n)=-a(n-1)+3*a(n-2), n>1 ; a(0)=1, a(1)=-3 .at n=12A152167
• The ED3 array read by antidiagonals.at n=23A167572
• The fifth row of the ED3 array A167572.at n=2A167575
• The third column of the ED3 array A167572.at n=4A167578
• Expansion of e.g.f. sec(x*cosh(x)) (even powers only).at n=4A296740
• Number of ways to choose a constant rooted partition of each part in a rooted partition of n.at n=23A301762
• Triangle read by rows: T(n,k) is the number of weakly connected acyclic digraphs on n unlabeled nodes with k arcs, n >= 1, k = 0..(n-1)*n/2.at n=51A350449
• Triangle read by rows: T(n,k) is the number of unlabeled weakly connected acyclic digraphs with n arcs and k vertices, n >= 0, k = 1..n+1.at n=61A350450
• Numbers k such that A360331(k) = A360331(k+1).at n=12A360359