a(n) = index of first derangement of 1..n (n>=2).

A134316

a(n) = index of first derangement of 1..n (n>=2).

Terms

    a(0) =2a(1) =4a(2) =8a(3) =28a(4) =128a(5) =748a(6) =5168a(7) =41068a(8) =368048a(9) =3669868a(10) =40284848a(11) =482671468a(12) =6267305648a(13) =87660962668

External references