Methuselah

Experts have named the oldest known bristlecone pine "Methuselah." It is somewhere in the White Mountains of California. But it is not marked in any special way, so that people do not try to damage it.

Tom is as old as Methuselah.

I feel as old as Methuselah.

And Methuselah lived an hundred eighty and seven years, and begat Lamech: And Methuselah lived after he begat Lamech seven hundred eighty and two years, and begat sons and daughters:

The first known methuselah was the r pentomino, but even longer lasting ones have been found by enumerating and testing small patterns. The following, called "rabbits," takes over 10000 generations to stabilize.

Is there somewhere a list of n-cell methuselah patterns in Conway's Life? (assuming some reasonable limits on the bounding box)

The pattern below seems to take about 30000 generations to stabilize. The initial population is 20. Is this methuselah a known one?