The game of Mousetrap with n cards: the number of permutations of n cards in which 2 is the only hit.

A002469

The game of Mousetrap with n cards: the number of permutations of n cards in which 2 is the only hit.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =5a(4) =31a(5) =203a(6) =1501a(7) =12449a(8) =114955a(9) =1171799a(10) =13082617a(11) =158860349a(12) =2085208951a(13) =29427878435a(14) =444413828821

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