Revert transform of (1 + x - x^3)/(1 + 2x + 2x^2).

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =26a(6) =72a(7) =205a(8) =600a(9) =1790a(10) =5428a(11) =16676a(12) =51800a(13) =162408a(14) =513288a(15) =1633543a(16) =5230506a(17) =16838080a(18) =54465356a(19) =176933606a(20) =577002976a(21) =1888274740a(22) =6199187904a(23) =20411160754a(24) =67384417204a(25) =223006818992a(26) =739711312416