Template:Category link with count
From dtype.org
[[:Category:{{#ifeq:{{{1}}}{{|Category:|Template:Str right|{{{1}}}}}|{{#if:|{{{name}}}|Category:{{#ifeq:{{{1}}}{{|Category:|Template:Str right|{{{1}}}}}}}]] (0) {{#invoke:documentation|main|_content={{ {{#invoke:documentation|contentTitle}}}}}}