x = 23, y = 18, rule = B345/S5
7bobobobo$7bobobobo$6bobobobobo$6bo7bo$4bo11bo$4bo11bo$bbo15bo$bbo15bo
$o19bo$o19bo$bbo19bo$bbo19bo$4bo15bo$4bo15bo$6bo11bo$6bobobobobobobo$
7bobobobobobo$7bobobobobobo!
The hollow hexagon which starts a period 6 oscillator.
However, it takes about 25700 generations before it settles down
to that period.
Andrew Trevorrow, July 1995
