>Actually isn't it 25,25,50,100,200,300 so far, like the 1,1, at the start of the Fibonacci sequence?

exactly, which highlights that the sequence just shifted and is why I put the disclaimer on my prediction - we don't have enough evidence to reliably predict where it's going next -- or haven't been clever enough to see the real pattern (or there in no pattern and it is just a programmer's whim).