« first day (27 days earlier)      last day (87 days later) » 

20:10
We really have to get rid of this current sequence as fast as possible, can't wait to get to 300:
> a(n) = (2^(2^n) + (2^n-1)*2^(2^(n-1)+1))/2^(n+1)
21:07
There you go

« first day (27 days earlier)      last day (87 days later) »