A007801 Expansion of f(f(x)), where f = x + x^2 + x^4 + x^8 + x^16 + ...

1, 2, 2, 3, 6, 8, 8, 16, 22, 40, 80, 146, 240, 356, 488, 661, 870, 1184, 1936, 3750, 7976, 17628, 37528, 74828, 140480, 249444, 420392, 678432, 1056600, 1593512, 2334928, 3337410, 4660246, 6364080, 8527984, 11258182, 14753032, 19622940, 27836440