Double factorial
English
Etymology
From Template:Compound.
Noun
- Template:Lb For an odd integer, the result of multiplying all the odd integers from 1 to the given number; or for an even integer, the result of multiplying all the even integers from 2 to the given number; symbolised by a double exclamation mark (!!). For example, 9!! = 1 × 3 × 5 × 7 × 9 = 945.
Translations
- Catalan: Template:T
- Dutch: Template:T
- Esperanto: Template:T
- French: Template:T
- German: Template:T, Template:T
- Portuguese: Template:T
- Spanish: Template:T
- Thai: Template:T
Further reading
- MathWorld, Double Factorial