A049131 Revert transform of (1 + 2x - x^2)/(1 + 3x + 2x^2 + x^3).

1, 1, 2, 4, 10, 24, 65, 171, 482, 1338, 3868, 11110, 32707, 96137, 287001, 857577, 2588794, 7830730, 23854028, 72840384, 223557060, 687811608, 2124300494, 6576110024, 20418808851, 63534855143, 198178318008, 619338524116