E.g.f.: A(x) = -log(3-exp(x)-exp(x^2)).

Terms

a(0) =0a(1) =1a(2) =4a(3) =12a(4) =86a(5) =590a(6) =6032a(7) =66948a(8) =913754a(9) =13855542a(10) =239928992a(11) =4579666916a(12) =96564964322