Quoted By:
These are my personal favorites
Less than 13 episodes:
Alien 9 (4 episodes)
Yokohama Kaidashi Kikou (2 episodes)
Ayakashi: Bakeneko Arc (3 episodes)
0080 (6 episodes)
Neo Tokyo (3 episodes)
13-ish episodes:
Serial Experiments Lain
Haibane Renmei
Boogiepop Phantom
Danshi Koukousei no Nichijou
Shoujo Shuumatsu Ryouko
Shorts:
Magnetic Rose (30 mins)
Robot Carnival Episodes 4 and 6 (10 mins each)
Nekojiru-Sou (30 mins)
Nighthawk Star (10 mins)
Ein Landarzt (20 mins)