I already checked, but it didn't help.
If these are maintenance plans stored on SQL Server, you can query msdb.dbo.sysssispackages and if you include where package type = 6, that returns the rows that are maintenance plans. From there you need to shred the xml in the packagedata column. I don't think you will get the sequences too easily, if at all. Sequences of tasks depend on precedent constraints so that would need to be accounted for. But that's where the data is.
Sue