Using ls from GNU coreutils (default on most Linux systems):
$ ls -v -1
This will list the filenames in one single column (-1), sorted using the natural sort order for numbers within the filename ("version sorting", -v). This assumes that all filenames have the same prefix string up to the actual number (anacovaux_ for example).
For systems without GNU ls:
$ print '%s\n' * | sort -t '_' -k2,2n
This will sort the names on the number after the first _ character in the name. Again, it assumes that the filename prefix is constant (this solution totally ignores the prefix up to the first _).