by way of (an?) apology


Senior Member
The Big Bang Theory Season 03 Episode 15

Sheldon: It’s by way of an apology for my recent behaviour. I’ve had some time to reflect and I’ve come to realize that friendship is not an aggregation of written agreements. It’s a result of two people respecting and caring for each other. Butterscotch scone?

I guess it's OK whether or not there's the indefinite article, 'an', inbetween of and apology. Correct me if I am wrong, please.
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