2312310

Appears in sequences

• a(n) = binomial(n+6,6) * binomial(n+10,6).at n=5A103604
• a(n) = binomial(n+5,n)*binomial(n+9,n).at n=6A105252
• G.f.: A(x,y) = Sum_{n>=0} exp(-y/(1-n*x)) * y^n/(1-n*x)^n / n!.at n=52A245111
• Numbers k such that phi(phi(k))/k < phi(phi(m))/m for all m < k, where phi is Euler's totient function (A000010).at n=26A293714