You need a Mutation Lab for mutagen income.
(You need Food Production if you want to harvest Pandorans for food.)

Are you referring to the Vanilla wiki?
Link to TFTV’s wiki: http://wiki.phoenixpoint.com/Terror_from_the_Void
Many, many things are different.

No I am referring to TFTV

I already have mutation lab

My understanding is to get more mutagens I need to merely hold as many pandorans in containment as I can? So build more containment and capture more and this will increase my mutagen income? It currently says +56 but I want more

56 is max extraction per day for 1 Mutation Lab.
A mouse over should you tell this.
Build more Mutation Labs (and if necessary more Containment).

It's still confusing.

1 mutation lab with 50 containment generates X mutagens
2 mutation labs with 50 containment generates how many mutagens?

100 containment and 1 mutation lab generate how many?
200 containment and 1 mutation lab generate how many?

Is there a formula as to how increased containment and increase in labs relate to how many mutagens?

The ratio mutagen income/containment slot isn’t the same for different types of Pandorans.
Looking at their “food value“ should give you a hint.
1 Mutation Lab is max. 50 mutagens via extraction. You need more Mutation Labs and then -maybe- more Containment.

And be aware that psychic Pandorans in Containment may have a downside.

Alright I'm building more containments and mutation labs

I've found that with two Mutation Labs and one full Containment, mutagen production gets close to 100. A full Containment wastes some production if there is only 1 Mutation Lab.

I'll have 3 labs and 3 containments... I keep getting delerium. Let alone have enough for any mutoids