Number of derangements on n elements with an even number of cycles.
A216778
Number of derangements on n elements with an even number of cycles.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =0a(4) =3a(5) =20a(6) =130a(7) =924a(8) =7413a(9) =66744a(10) =667476a(11) =7342280a(12) =88107415a(13) =1145396460a(14) =16035550518a(15) =240533257860
External references
- oeis: A216778