Frequency of nucleotides and oligonucleotides in a sequence

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Ocurrences for oligonucleotides of length:
  1 2 3 4 5 6 7 8
Standarized frequencies for oligonucleotides of length:
  1 2 3 4 5 6 7 8
Other frequencies:
  Zero'th Order Markov chain for tetranucleotides (ZOM)
  Fist Order Markov chain for tetranucleotides (FOM)
  Second Order Markov chain for tetranucleotides (SOM)
  Z-scores for tetranucleotides

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This version does not work with degenerated nucleotides.
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