muzik wrote:...if someone could find a gliders synth for that pattern and then destroy one of the hives cleanly it could be used as a fairly useful beehive inserter.
"Fairly useful" might be a bit of a stretch, just because we already have various beehive "factories" that are a lot simpler than this is going to be, assuming someone did the research to find a glider synthesis.
Just to explain Mark Niemiec's database a little bit: arbitrary patterns that are not still lifes, oscillators, or spaceships are pretty much never going to show up in searches -- with the rare exception of a few named patterns, like the B or pi heptominoes.
When you load the current version of Niemiec's database, you'll see that it says "11177 patterns loaded".
There are more than 11,177 different 9-bit patterns --
118,133 polyplets, if the OEIS can be believed, and a lot more than that if you allow gaps of a cell or two. Hundreds or thousands of these would produce a pair of beehives when you run them to stabilization.
Niemiec's database and similar resources like
Catagolue mostly only let you look up final stable states -- things that might show up in the settled
ash of a pattern. Storing all the possible starting states isn't really a workable option.