A049143 Revert transform of (1 - x - 2x^2 + x^3)/(1 - 2x^2 - 2x^3).

1, 1, 2, 4, 10, 26, 74, 219, 678, 2160, 7062, 23538, 79734, 273600, 948972, 3320845, 11708586, 41546434, 148236556, 531446460, 1913357426, 6914471176, 25071324984, 91181690872, 332528253078, 1215726924628, 4454924130364