G.f. A(x) satisfies: 1/(1-x) = Product_{n>=1} A( x^n/(1+x)^n ).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =9a(6) =17a(7) =36a(8) =71a(9) =143a(10) =284a(11) =573a(12) =1140a(13) =2287a(14) =4568a(15) =9138a(16) =18272a(17) =36559a(18) =73098a(19) =146216a(20) =292413a(21) =584836a(22) =1169657a(23) =2339353a(24) =4678655a(25) =9357356a(26) =18714673a(27) =37429377a(28) =74858706a(29) =149717506