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

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =30a(5) =170a(6) =1242a(7) =9534a(8) =86118a(9) =797778a(10) =8327410a(11) =88438966a(12) =1032534190a(13) =12233231738a(14) =156832510922