Wodehousean vs Wodehousian

Wodehousean

Wodehousian

adj
  • Of or pertaining to P. G. Wodehouse (1881–1975), English writer and humorist known for his eccentric half-witted characters. 

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