: new keyword: probation

[Marc LeBrun]

 > On the other hand, check out: [A028866]
 > I can't imagine any possible mathematical use for this sequence.

Good grief, the silliness has progressed further than I had imagined!
(And that one apparently doesn't even have the "base" keyword asserted).

 > I have sometimes thought that there ought to be a keyword for sequences
 > (like A115380) which are "real-world" instead of mathematical.

"contingent" perhaps, as it's applied to essentially descriptive or
observational disciplines such as history, geography or their like.