A049177 Revert transform of 2*(1 + x + x^2 + x^4 + x^6)-1/(1-x).

1, 1, 3, 11, 45, 197, 903, 4277, 20773, 102893, 517771, 2639571, 13603509, 70758321, 370979823, 1958471433, 10401832121, 55542275273, 297991827555, 1605599352347, 8684388729741, 47136082628653, 256651601838839