Number of ordered pairs of permutation functions f,g on a size n set where f(g(g(x))) = g(f(f(x))).
A239836
Number of ordered pairs of permutation functions f,g on a size n set where f(g(g(x))) = g(f(f(x))).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =48a(5) =360a(6) =2880a(7) =20160a(8) =241920a(9) =3265920a(10) =47174400a(11) =678585600a(12) =12933043200a(13) =193037644800
External references
- oeis: A239836