Problem: Derangements

Code: Derangements/tails_1645189937

Nibbles version: 0.2 | 0.21 | 0.22 | 0.23 | 0.24 | 0.25 | 1.00

Format: Compact | Simple | +Type | Table | JSON | .nbl (DeBruijn) | .nbl (names)

| ``p , 6 
  `* ! $ 
       , 6 
       ! 
: $ 
  ~