A049145 Revert transform of (1 + x - x^3)/(1 + 2x + 2x^2).

1, 1, 2, 4, 10, 26, 72, 205, 600, 1790, 5428, 16676, 51800, 162408, 513288, 1633543, 5230506, 16838080, 54465356, 176933606, 577002976, 1888274740, 6199187904, 20411160754, 67384417204, 223006818992, 739711312416, 2458778309456