knowledge – Nickname the number sequence

I have two sequences for you. Here is the start of each:

• A stricter version: 5, 0, 0, 0, 6, 11, 8, 2, 4, 0 […]
• A lenient version: 9, 0, 0, 0, 13, 15, 14, 7, 7, 0 […]

And in case you’re wondering whether all of the 0s match up between them: nope! If I’d kept going, element 23 of the “strict” sequence is a 0, while it’s a 1 in the “lenient” sequence.

For each sequence, where is 1) the last nonzero number, and 2) the last zero?