a(0) = -1; for n > 0, number of indecomposable derangements, i.e., no fixed points, and not fixing [1..j] for any 1 <= j < n.
A259869
a(0) = -1; for n > 0, number of indecomposable derangements, i.e., no fixed points, and not fixing [1..j] for any 1 <= j < n.
Terms
- a(0) =-1a(1) =0a(2) =1a(3) =2a(4) =8a(5) =40a(6) =244a(7) =1736a(8) =14084a(9) =128176a(10) =1292788a(11) =14313272a(12) =172603124a(13) =2252192608a(14) =31620422980a(15) =475350915656
External references
- oeis: A259869