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We seemed to have both a [sequences-and-series] tag as well as a [sequence] tag:
http://mathoverflow.net/questions/tagged/sequences-and-series
http://mathoverflow.net/questions/tagged/sequences
the latter is perhaps redundant?
I just noticed that there is a (recent?) 'homework' tag and somebody (not OPs) tagging things with this. For several reasons I think having this tag is a bad idea. One is that it can suggest homework is on-topic.
To add to JC: there seems to also now be a [numerical-analysis] http://mathoverflow.net/questions/tagged/numerical-analysis which should definitely be merged into [na.numerical-analysis].
There are many questions marked [operads] and precisely one marked [operad].