Airbus A321neo
Seats are very tight, and the arm rests are very thin.
Fortunately, seats which are thin at the bottom give more space for the legs.
40 rows, total 237 seats - last row 3 seats (d, e, f)
5 flight attendants - I believe the rule says every 50 passengers need 1 flight attendant.

The passenger seated next to me was a guy. The tight seating really made me feel uncomfortable 🤣

Note:
The card is for you to gauge how thin the arm rest is.