Browncoat vs flan

Browncoat

noun
  • A fan of the TV series Firefly. 

flan

noun
  • A fan of the U.S. TV series Firefly. 

  • A coin die. (Compare planchet.) 

  • Baked tart with sweet or savoury filling in an open-topped pastry case. (Compare quiche.) 

  • A dessert of congealed custard, often topped with caramel, especially popular in Spanish-speaking countries. 

verb
  • To splay or bevel internally, as a window-pane. 

How often have the words Browncoat and flan occurred in a corpus of books? (source: Google Ngram Viewer )