a(n) = 1 + 1/log(gamma(2-a(n-1))).

Terms

a(0) =0a(1) =7a(2) =1a(3) =18a(4) =0a(5) =55a(6) =1a(7) =295a(8) =0a(9) =2412a(10) =1a(11) =28397a(12) =0a(13) =455264a(14) =1a(15) =9487328a(16) =0a(17) =247621547