What is the firing order for a straight six?

As said before, this is how a MAN can remember the firing order on a straight 6 engine.... 15 is too young, 36 is past her prime while 24 is just right... (1-5-3-6-2-4)

All engines, with exeption of the five cylinder, have different firing order possibilities. With the straight or v six the other possibilities are 1-2-4-6-5-3 and 1-5-4-6-2-3. But the answer mentioned before is the most common.