I've Tried using the settings you have used and while I did not have any crashes I got an indefinite game creation item.

The Game gave a "ArgumentOutOfRangeException: Argument is out of range. Parameter name: index" in the diagnostics

Which makes me suspect that with some many nodes its running out of something during game creation maybe it reaches the max amount of star-systems (there are only 251 star names) or planet or maybe even star-lanes.

Unless there is a way to increase the index range of whatever is running out you will be limited to a small number of node than 240

I Have done some testing on this matter and found that while 240 node is too much (note 140 is default for the largest systems) 150 and 200 both work but 210, 220 and 240 do not

If you don't mind me asking why do you want so many nodes? as that large of a galaxy will alter game balance greatly making some factions & traits OP and others near worthless.