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

A126617

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

Terms

    a(0) =1a(1) =-1a(2) =2a(3) =-3a(4) =7a(5) =-10a(6) =31a(7) =-21a(8) =204a(9) =307a(10) =2811a(11) =12100a(12) =74053a(13) =432211a(14) =2768858a(15) =18473441a(16) =129941283a(17) =956187814a(18) =7351696139a(19) =58897405759a(20) =490681196604

External references