[arsonal]

I went through episode 17 to see who sat where. These are all current members of AKB0048.

Spoiler for episode 17 seating order:

BACK ROW (L-R)
Sono Chieri (77th Gen.)
Nagisa Motomiya (77th Gen.)
Yuuka Ichijou (77th Gen.)
---
Orine Aida (77th Gen.)
Makoto Yokomizo (77th Gen.)
Suzuko Kanzaki (77th Gen.)
---
Sonata Shinonome (77th Gen.)
Kanata Shinonome (75th Gen.)
Mimori Kishida (75th Gen.)
---
Himeko Ichioka (76th Gen.)
Rie Hasumi (76th Gen.)
Umi Doujima (76th Gen.)

MIDDLE ROW (L-R)
Mizuho Shirai (76th Gen.)
Megumi Wanibuchi (76th Gen.)
Hazuki Yanagikawa (76th Gen.)
---
Akira Shiradou (76th Gen.)
Sae Miyazawa 10th (Youko Asamiya, 76th Gen.)
Sayaka Akimoto 10th (Akira Igarashi, ?th Gen.)
---
Aki Takajou ?th (??, ?th Gen.)
Yuki Kashiwagi 6th (Ayako Kuroki, ?th Gen.)
Mayu Watanabe type3 (Mayu Watanabe, ?th Gen.)
---
Asuka Kuramochi ?th (??, ?th Gen.)
Shizuka Ooya ?th (??, ?th Gen.)
Yuka Masuda ?th (??, ?th Gen.)

FRONT ROW (L-R)
Haruka Shimazaki ?th (??, ?th Gen.)
Yuuko Ooshima 9th (Hikari Kimijima, ?th Gen.)
---
Yui Yokoyama ?th (??, ?th Gen.)
Minami Takahashi 5th (Shiori Arisawa, ?th Gen.)
Ayaka Umeda ?th (??, ?th Gen.)
---
Haruna Kojima 8th (Chiharu Sakuragi, ?th Gen.)
Tomomi Itano 11th (Tomoyo Itano, ?th Gen.)
Rie Kitahara 9th (??, ?th Gen.)
---
Haruka Katayama ?th (??, ?th Gen.)
Aika Oota ?th (??, ?th Gen.)

Notes:
- Yuuko (Hikari) and Kojiharu (Chiharu) are from the same generation.