While looking for seeds today, I stumbled upon a somewhat rare yet interesting one. This seed spawns you next to a single house, with only one villager, the librarian.
What happened to the rest of the villagers? Who knows…
There’s also some horses near the house as well.
Tested in Minecraft 1.9, 1.8 & 1.7 (PC/Mac).
(In 1.7 there’s no horses, but plenty of sheeps, pigs & cows.)