A063823 G.f.: (1-2*x^2-3*x^3)/((1-x^3)*(1-2*x))

1, 2, 2, 2, 4, 6, 10, 20, 38, 74, 148, 294, 586, 1172, 2342, 4682, 9364, 18726, 37450, 74900, 149798, 299594, 599188, 1198374, 2396746, 4793492, 9586982, 19173962, 38347924, 76695846, 153391690, 306783380, 613566758, 1227133514