Problem Statement

These number series are an expansion of the ordinary Fibonacci sequence where: For small values of

n

{\displaystyle n}

, Greek numeric prefixes are sometimes used to individually name each series. Allied sequences can be generated where the initial values are changed:

Let's start with the solution:

NStep ← ⊑(1↓⊢∾+´)∘⊢⍟⊣
Nacci ← (2⋆0∾↕)∘(⊢-1˙)

>((↕10) NStep¨ <)¨ (Nacci¨ 2‿3‿4) ∾ <2‿1