G.f. A(x) satisfies 0 = A(0) and 0 = f(x, A(x)) where f(u, v) = (v - u) * (1 + u*v) - v * (v + u).

A245734

G.f. A(x) satisfies 0 = A(0) and 0 = f(x, A(x)) where f(u, v) = (v - u) * (1 + u*v) - v * (v + u).

Terms

    a(0) =0a(1) =1a(2) =2a(3) =6a(4) =20a(5) =74a(6) =294a(7) =1228a(8) =5318a(9) =23662a(10) =107512a(11) =496726a(12) =2326462a(13) =11020424a(14) =52706138a(15) =254148326a(16) =1234240140a(17) =6031310162a(18) =29635011990a(19) =146323849876a(20) =725635937678

External references