Hi Jeff. Just to confirm, are you wanting your Google routine to trigger a sequence in SEQUEmatic?
If so, there is a Google action which will let you do that. First you'll need to ask the Google assistant to 'talk to SEQUEmatic' in order to link your account. Unfortunately it often has difficulty understanding the word SEQUEmatic, so if you can use your phone and type to the assistant that will work better.
After your account is linked, you can trigger sequences from the assistant by saying 'Ask SEQUEmatic to run the evening lights sequence' where 'evening lights' is the name of one of your sequences. To trigger this from a routine, you could type that sentence as one of the steps in the routine.
Hopefully that achieves what you need, but let me know if you have any questions.