5201061455

Appears in sequences

• Number of connected permutations of [1..n] (those not fixing [1..j] for 0 < j < n). Also called indecomposable permutations, or irreducible permutations.at n=13A003319
• G.f. A(x) satisfies: [x^n] A(x)^n = [x^n] A(x)^(n-1) for n>1 with A(0)=A'(0)=1.at n=13A158882
• A recurrent sequence in Panaitopol's formula for pi(x), where pi(x) is the number of primes <= x.at n=12A233824
• Bisection of A003319: a(n) = A003319(2n+1).at n=6A272657