Delete only the nth block of text, multi-line

Using GNU sed 4.2.2-4ubuntu1 on Ubuntu 14.04 LTS GNU/Linux


I have some blocks of text spread over multiple lines and delimited by [
and ].  ( See the tail of the message for an example. )  I'd like to
delete the nth [ ] block.  The following pattern will delete all [ ] blocks:


 sed '/^\[$/,/^\]/d' in > out


That deletes more than I want deleted.  How can I make a sed formula or
two that only deletes the nth block and leaves the others?


Regards,
/Lars


###


foo
[
  aaa
  bbb
  ccc
]
[
  ccc
  bbb
  aaa
]
[
  bbb
  ccc
  aaa
]
[
  bbb
  aaa
  ccc
]
bar


###