Number of endofunctions f on [2n] that are self-inverse on [n].
A245141
Number of endofunctions f on [2n] that are self-inverse on [n].
Terms
- a(0) =1a(1) =3a(2) =50a(3) =1626a(4) =83736a(5) =6026120a(6) =571350096a(7) =67996818960
External references
- oeis: A245141