a(1) = 1, for n >= 2: a(n) = a(n-1)^(n-1) - 1.A175981a(1) = 1, for n >= 2: a(n) = a(n-1)^(n-1) - 1.Terms a(0) =1a(1) =0a(2) =-1a(3) =-2a(4) =15a(5) =759374External referencesoeis: A175981