Ctrl-down/up in emacs in Mac Terminal

Finding the answer to this online pretty much drove me nuts. I'm sharing it here for you, future Internet user.

Here's the situation:

• I use Emacs
• I use Emacs in the Mac Terminal
• \C-down was bound to forward-paragraph by default (and \C-up bound to backward-paragraph by default).
• I wanted them to actually work, but they didn't.

Through some series of trickery I was able to figure out that the Mac terminal was sending the wrong escape sequences for cltr-up and down. Specifically, it wasn't sending anything at all, beyond just the down key. I fixed it with the following settings:

1. From the terminal, go to "Preferences" "Settings" "Keyboard"
2. Look for and modify, or add actions for ctrl-up and ctrl-down:
1. ctrl-up = \033[1;5A
2. ctrl-down = \033[1;5B