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20 cells 9x9 71 gen, probably semi-significant 22 cells 9x8 68 gen:

I decided to post an updated list of the longest-lasting known diehards with low cell counts, namely 1 - 17 and 20. There hasn't been much progress on this subject lately, and the older list in the first post of this thread is outdated. Again, there is a restriction that each pattern on the list must fit into a 2N x 2N bounding box, where N is its population.

Most of the entries are the same as in the earlier list, except the ones for 8, 12, 14, 17 and 20 cells. Note, that I have changed the orientation of some of the patterns and made some minor modifications that don't affect the patterns' lifespans or cell counts. All of the patterns in this post are already known, but they were scattered across multiple different posts. That's why I'm posting this list.

1 cell --> 1 tick
2 cells --> 1 tick
3 cells --> 2 ticks
4 cells --> 5 ticks
5 cells --> 8 ticks
6 cells --> 46 ticks: 7 cells --> 130 ticks: 8 cells --> 176 ticks: 9 cells --> 229 ticks: 10 cells --> 270 ticks: 11 cells --> 419 ticks: 12 cells --> 541 ticks: 13 cells --> 738 ticks: 14 cells --> 780 ticks: 15 cells --> 1071 ticks: 16 cells --> 1100 ticks: 17 cells --> 1247 ticks: 20 cells --> 1411 ticks: