G.f. satisfies: A(x) = 1 + x*A(1 - 1/A(x))^2.

Terms

a(0) =1a(1) =1a(2) =2a(3) =7a(4) =36a(5) =235a(6) =1792a(7) =15261a(8) =141382a(9) =1401334a(10) =14694166a(11) =161714217a(12) =1857003186a(13) =22152227989a(14) =273573165626