Letter/number pattern lists
The biggest list is currently 6L (LLLLLL), which contains a mind-boggling 308,915,776 combinations of letters (2,4GB .txt inside an 8,6MB .rar).
Feel free to send list requests via email if what you need isn't in the tables. As long as the output doesn't get too unwieldly in terms of size I'm happy to help.
LNNN.txt (26000), LLLL.txt (456976), LLNN.txt (67600), NLNN.txt (26000), LLNL.txt (175760), NLLL.txt (175760), NLLN.txt (67600), LNLL.txt (175760), NNNL.txt (26000), NNNN.txt (10000), LLLN.txt (175760), LNNL.txt (67600), NNLN.txt (26000), NNLL.txt (67600)