240120

Appears in sequences

• Number of words of length 4 in the n(n-1)/2 transpositions of S[ n ] equivalent to the identity.at n=23A029699
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 49.at n=9A031727
• Numbers n such that sigma(phi(n))-phi(n) = phi(sigma(n)-n).at n=14A132793
• E.g.f. satisfies (1-x*A(x))*A(x*e^x)=1.at n=8A184932