a(n) = Sum_{i=0..n} (-2)^i*binomial(n,i)*B(i) where B(n) = Bell numbers A000110(n).

A124311

a(n) = Sum_{i=0..n} (-2)^i*binomial(n,i)*B(i) where B(n) = Bell numbers A000110(n).

Terms

    a(0) =1a(1) =-1a(2) =5a(3) =-21a(4) =121a(5) =-793a(6) =5917a(7) =-49101a(8) =447153a(9) =-4421105a(10) =47062773a(11) =-535732805a(12) =6484924585a(13) =-83079996041

External references