155675520

Appears in sequences

• Expansion of e.g.f. x*(1 - 2*x - sqrt(1-4*x))/2.at n=9A052711
• Expansion of e.g.f. x*(1 - sqrt(1 - 4*x))/2.at n=9A052717
• a(n) = (n+3)!/(d(n)*d(n+1)*d(n+2)) where d(n) = cancellation factor in reducing Sum_{k=0...n} 1/k! to lowest terms.at n=10A123900
• Numbers m such that sigma(m)/esigma(m) > sigma(k)/esigma(k) for all k < m, where sigma(m) is the sum of divisors of m (A000203) and esigma(m) is the sum of exponential divisors of m (A051377).at n=17A335396