x = 21, y = 15, rule = B345/S5
5bobobobobo$5bobobobobo$4bobobobobobo$4bo9bo$bbo13bo$bbo13bo$o17bo$o
17bo$o19bo$o19bo$bbo15bo$bbo15bo$4bobobobobobobo$3bobobobobobobobo$5bo
bobobobobo!
The beginning of a large period oscillator showing the hollow hexagon
before it becomes filled with stripes.  After about 40000 to 60000
generations it becomes periodic with period 14294.
Andrew Trevorrow, July 1995