Lower-Trimmed Subsequence
The lower-trimmed subsequence of 
is the sequence 
obtained by subtracting 1 from each 
andthen removing all 0s. If 
is a Fractal Sequence, then is a Fractal Sequence.If is a Signature Sequence, then 
.
References
Kimberling, C. ``Fractal Sequences and Interspersions.'' Ars Combin. 45, 157-168, 1997.
- Lattice
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