User:Σ/Testing facility/Factorial

{{#expr:{{#ifeq:{{#expr:{{{1|00}}}>=00}}|1|01}}{{#ifeq:{{#expr:{{{1}}}>=01}}|1|*01}}{{#ifeq:{{#expr:{{{1}}}>=02}}|1|*02}}{{#ifeq:{{#expr:{{{1}}}>=03}}|1|*03}}{{#ifeq:{{#expr:{{{1}}}>=04}}|1|*04}}{{#ifeq:{{#expr:{{{1}}}>=05}}|1|*05}}{{#ifeq:{{#expr:{{{1}}}>=06}}|1|*06}}{{#ifeq:{{#expr:{{{1}}}>=07}}|1|*07}}{{#ifeq:{{#expr:{{{1}}}>=08}}|1|*08}}{{#ifeq:{{#expr:{{{1}}}>=09}}|1|*09}}{{#ifeq:{{#expr:{{{1}}}>=10}}|1|*10}}{{#ifeq:{{#expr:{{{1}}}>=11}}|1|*11}}{{#ifeq:{{#expr:{{{1}}}>=12}}|1|*12}}{{#ifeq:{{#expr:{{{1}}}>=13}}|1|*13}}{{#ifeq:{{#expr:{{{1}}}>=14}}|1|*14}}{{#ifeq:{{#expr:{{{1}}}>=15}}|1|*15}}{{#ifeq:{{#expr:{{{1}}}>=16}}|1|*16}}{{#ifeq:{{#expr:{{{1}}}>=17}}|1|*17}}{{#ifeq:{{#expr:{{{1}}}>=18}}|1|*18}}{{#ifeq:{{#expr:{{{1}}}>=19}}|1|*19}}{{#ifeq:{{#expr:{{{1}}}>=20}}|1|*20}}

}}