Are you sure about the first rule? It doesn't seem necessary according to https://oeis.org/A014575.
The problem is really fun.
Since I created the problem series and want the Functions I badge, I thought I'd provide the solution that incorporates vampire_factor and are_fangs. Not a great score, but readable!
Sorry, I mean the Magic Numbers badge.
Select every other element of a vector
How to subtract?
Remove the two elements next to NaN value
There are 10 types of people in the world
Product of two multivariate polynomials
Outer product of multiple vectors
Multivariate polynomials - sort monomials
Multivariate polynomials - overload multiplication
Find all vampire fangs
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