TT routines allow computing the following transforms:
Forward staggered sine transform 
Backward staggered sine transform 
Forward staggered2 sine transform 
Backward staggered2 sine transform 
Forward staggered cosine transform 
Backward staggered cosine transform 
Forward staggered2 cosine transform 
Backward staggered2 cosine transform 
Note
The size of the transform n can be any integer greater or equal to 2.