Number of ordered pairs of permutation functions on n elements satisfying f(g(g(g(x)))) = g(g(g(f(x)))).
A255440
Number of ordered pairs of permutation functions on n elements satisfying f(g(g(g(x)))) = g(g(g(f(x)))).
Terms
- a(0) =1a(1) =1a(2) =4a(3) =24a(4) =288a(5) =3240a(6) =74160a(7) =1970640a(8) =55762560a(9) =2271628800a(10) =118676275200
External references
- oeis: A255440