Lower-Trimmed Subsequence

The lower-trimmed subsequence of $x=\{x_n\}$ is the sequence $V(x)$ obtained by subtracting 1 from each $x_n$ and then removing all 0s. If $x$ is a Fractal Sequence, then $V(x)$ is a Fractal Sequence. If $x$ is a Signature Sequence, then $V(x)=x$.

See also Signature Sequence, Upper-Trimmed Subsequence

References

Kimberling, C. ``Fractal Sequences and Interspersions.'' Ars Combin. 45, 157-168, 1997.