Catalan numbers

# title: Catalan numbers
# source: https://rosettacode.org/wiki/Catalan_numbers
# category: Rosetta Code
# difficulty: Intro
# summary: Generate the opening Catalan numbers with the standard multiplicative recurrence.
# tags: popular, math, sequences, combinatorics
# vibe: 0.2

def catalan_numbers(count)
  values = [1]
  index = 0

  while values.length < count
    current = values[index]
    next_value = current * 2 * ((2 * index) + 1) / (index + 2)
    values = values.push(next_value)
    index = index + 1
  end

  values
end

def run
  catalan_numbers(10)
end