859580

Appears in sequences

• a(n) = 2n*a(n-1) - (n-1)^2*a(n-2).at n=8A002793
• Numerators of continued fraction for alternating factorial.at n=16A056952
• Expansion of (1 + x)/(1 - x^3*(1 + x)^4).at n=25A375320