Problem 45189. Double Factorial

        n(n-2)...(5)(3)(1),   n>0, odd
n!!  =  n(n-2)...(6)(4)(2),   n>0, even
        1                 ,   n = -1, or n = 0

Solution Comments

Problem Recent Solvers67

Suggested Problems

• Triangle Numbers Below N

  236 Solvers

• Fahrenheit to Celsius converter

  600 Solvers

• Find the product of a Vector

  348 Solvers

• Sum of integers numbers

  152 Solvers

• Number of Even Elements in Fibonacci Sequence

  1637 Solvers

More from this Author92

• Calculate F statistics ( One-way Analysis of Variance)

  15 Solvers

• Find a real root of a quintic function without using roots function

  13 Solvers

• Hexagonal numbers on a spiral matrix

  164 Solvers

• Recaman Sequence - III

  88 Solvers

• Find two triangular numbers whose sum is input.

  102 Solvers