1 + (389/32 - 2056005/233522 Log[2] + 8190315/934088 Log[3]) et^2 + (3577/64 + 50149295/467044 Log[2] - 155615985/3736352 Log[3]) et^4 + (43049/256 - 12561332945/16813584 Log[2] + 4709431125/59781632 Log[3] + 182861328125/538034688 Log[5]) et^6
