[seqfan] Mousetrap

Charles Greathouse charles.greathouse at case.edu
Wed Apr 18 15:15:28 CEST 2012

A002467 is The game of Mousetrap with n cards (given n letters and n
envelopes, how many ways are there to fill the envelopes so that at
least one letter goes into its right envelope?).

A002468 and A002469 are named "The game of Mousetrap with n cards.".
How are these sequences defined, and how do they relate to A002467?

Charles Greathouse
Case Western Reserve University

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