Blurb::
Choose where to start sampling the sequence
Description::
\c sequence_start determines where in the sequence the samples will start. 

The default \c sequence_start is a 
vector with 0 for each variable, specifying that each sequence 
start with the first term. 
Topics::	
Examples::
For example, for the Halton sequence in base 2, if the user specifies 
sequence_start = 2, the sequence would not include 0.5 and 0.25, but 
instead would start at 0.75. 
Theory::
Faq::
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