426457

Appears in sequences

• Expansion of e.g.f.: sinh(x)/(1+x).at n=9A009628
• a(n) = (2*n-2)*(2*n-1)*a(n-1)+1.at n=5A051397
• Expansion of e.g.f. exp(x)/(1-x^2).at n=9A087208
• Number of increasing odd cycles in all permutations of {1,2,...,n}.at n=9A186763
• Numerators of fractions leading to e - 1/e (A174548).at n=9A195326
• Numerators of fractions leading to e - 1/e (A174548).at n=10A195326
• a(n) is the numerator of Sum_{k=0..n} 1 / (2*k+1)!.at n=4A354211