Number of once reformable permutations of {1,2,...,n}.

A007712

Number of once reformable permutations of {1,2,...,n}.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =14a(4) =72a(5) =316a(6) =1730a(7) =9728a(8) =64330a(9) =444890a(10) =3645441a(11) =28758111a(12) =265434293a(13) =2522822881a(14) =25717118338

External references