A049146 Revert transform of (1 + 3x - x^3)/(1 + 4x + 4x^2 + 2x^3).

1, 1, 2, 4, 10, 24, 66, 173, 498, 1378, 4070, 11680, 35078, 103292, 313980, 942133, 2890878, 8798182, 27204516, 83704806, 260493354, 808445448, 2529836520, 7906101138, 24858833998, 78131339008, 246694899708, 779057755912