Number of nonisomorphic 2-sets of permutations of an n-set.
A362764
Number of nonisomorphic 2-sets of permutations of an n-set.
Terms
- a(0) =0a(1) =1a(2) =5a(3) =23a(4) =89a(5) =484a(6) =2904a(7) =22002a(8) =190555a(9) =1876337a(10) =20445337a(11) =244087420a(12) =3161870208a(13) =44155439706a(14) =661065427533
External references
- oeis: A362764