a(0)=1; thereafter a(n) = -Sum_{i=1..n} a(n-i)^(2^i).

A264610

a(0)=1; thereafter a(n) = -Sum_{i=1..n} a(n-i)^(2^i).

Terms

    a(0) =1a(1) =-1a(2) =-2a(3) =-6a(4) =-54a(5) =-4470a(6) =-30229110

External references