Is it usually more or less than this?

Editor, Atom, Rust

I use and like Zotero and the one-click-save feature in Firefox is very convenient (IIRC, it takes a few minutes to set up though).

T = O(n) means that there exists a single constant k such that T < kn for all sufficiently large n. Therefore O(n!^2) is not the the same as O(n!), but for example both 10n!, 10000n!, n! + n^2 (note the plus) are O(n!).

Another way to think about this: suppose you believe that O(n) and O(n^2) are distinct. Now plug in only numbers that are factorials (2, 6, 24, …).