# code: http://golf.shinh.org/reveal.rb?Subfactorial+FIXED/tails_1645497593&nbb
# target Nibbles version: 0.23
# commenter version: 0.1.2.181

=\ #(scanl):[int] 
    , #(range from 1):[int] 
        50 #(integer):int 
    \B A 
    1 #(integer):int 
    \D C 
    `^ #(bit xor):int 
        * #(multiply):int 
            C #(@):int 
            D #($):int 
        ~ #(auto = 1):auto