G.f.: A(x) = x + Sum_{n>=1} x^(2*n) / (1+x)^A193259(n).

Terms

a(0) =1a(1) =1a(2) =-1a(3) =2a(4) =-5a(5) =12a(6) =-26a(7) =52a(8) =-101a(9) =201a(10) =-422a(11) =927a(12) =-2070a(13) =4579a(14) =-9894a(15) =20789a(16) =-42517a(17) =84937a(18) =-166570a(19) =322700a(20) =-622500a(21) =1207056a(22) =-2376168a(23) =4787523a(24) =-9908610a(25) =21021499a(26) =-45404102a(27) =98952388a(28) =-215756156a(29) =467541948