Specifying N revisions after the initial commit

Hi All,

Please CC me as I'm not subscribed.

I was hoping someone could help me with the revision shorthand to get the commit sha of a commit N commits after the initial commit. Thus far I've figured out that to get the initial commit in a repository, you can use:

git rev-list --max-parents=0 HEAD

but I can't figure out how to get "give me the commit sha1 of the commit immediately after the initial commit", or for some number N. I could always do something like:

git rev-list HEAD | tail -2

to get both, but I was curious if there was a refspec shorthand for this that could be used. It seems that git's rev parsing is all built on going backwards in order (and probably rightfully so).

Thanks in advance.

josh