20721

Appears in sequences

• Expansion of e.g.f. cosh(exp(x)*x).at n=8A009121
• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite MEL = ZSM-11 Nan[AlnSi96-nO192] starting with a T1 atom.at n=13A019148
• Numbers k such that (89*10^(k-1) + 1)/9 is a depression prime.at n=8A082719
• Expansion of e.g.f. (exp(x*exp(x)) + exp(x/exp(x)))/2.at n=8A195509
• Number of n-node unlabeled rooted trees with thinning limbs and root outdegree (branching factor) 2.at n=17A244703
• Expansion of 1/(1 - Sum_{k>=1} x^(k+floor(1/2+sqrt(k)))).at n=26A280240
• Odd numbers k such that phi(k) and cototient(k) have the same prime signature.at n=26A280927
• Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 4, 7 or 8 king-move adjacent elements, with upper left element zero.at n=7A316541
• Number of partitions p of n such that min(p) < (number of parts of p) < max(p).at n=40A325340