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

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =16a(6) =32a(7) =65a(8) =138a(9) =316a(10) =792a(11) =2142a(12) =6052a(13) =17316a(14) =49160a(15) =137109a(16) =374650a(17) =1004848a(18) =2658192a(19) =6982424a(20) =18351272a(21) =48607148a(22) =130447416a(23) =355542916a(24) =983250704a(25) =2749502132a(26) =7738681064a(27) =21826783844a(28) =61484999000a(29) =172649101544