Yes,
farseeing is in a few dictionaries, but then it's already accepted in Chihuahua. The dictionaries identify
farseeing as an adjective, not a verb, so this doesn't necessarily imply the existence of a verb
farsee.
Farsee and
farseer are in Wiktionary.
Farseer is in Dictionary.com as a run-on entry from
farseeing.
The usage of these words seems to be almost entirely related to fantasy and science fiction, especially the
Farseer trilogy by Robin Hobb. Perhaps the earliest example is in an 1887 translation of the
Odyssey by William Morris, referring to "Zeus the Farseer".
I did dig up one non-fantastic use of
farseer, in a 1957 book called
America Needs an Ideology:
The future belongs to the farseers. Henry Ford and Thomas Edison were both farseers - and both friends of Frank Buchman.
I'll add
farseer as a rare word, but I'm not convinced
farsee has really made it into the language. Wiktionary gives the origin of
farseer as far + seer.