3301820

Appears in sequences

• Alternating factorials: 0! - 1! + 2! - ... + (-1)^n n!at n=10A058006
• a(0) = 0, a(1) = 1, and for n >= 2, a(n) = (n-1) * a(n-2) + (n-2) * a(n-1).at n=11A153229
• Integral of exp(-x)*Phi_n(x) from 0 to infinity, Phi_n the n-th cyclotomic polynomial.at n=21A182103