Number of even cycles in range [A014137(2n)..A014138(2n)] of permutation A057505/A057506, with two fixed-points of A057164.
A081161
Number of even cycles in range [A014137(2n)..A014138(2n)] of permutation A057505/A057506, with two fixed-points of A057164.
Terms
- a(0) =0a(1) =1a(2) =4a(3) =16a(4) =60a(5) =225a(6) =848a(7) =3188a(8) =12095
External references
- oeis: A081161