Template talk:Factorial!

120 {{subst:#ifexpr:{{subst:#expr:5-1=1|{{{2}}}| {{subst:#ifexpr:3

{{subst:#ifexpr:5=1|1|{{subst:factorial!|{{subst:#expr:5-1}}{{subst:pipe}}{{subst:#expr:1*5}}}}}} {{subst:#ifexpr:4|5=1|{{{2}}}|{{subst:factorial!|{{subst:#expr:4|5-1}}{{subst:pipe}}{{subst:#expr:{{{2}}}*4|5}}}}}} 120

{{subst:factorial!|10|1}} gives

3628800

in two saves.

{{subst:factorial|10}} gives

3628800

in one save.