Number of permutations of [2n] with n components.
A308650
Number of permutations of [2n] with n components.
Terms
- a(0) =1a(1) =1a(2) =7a(3) =58a(4) =531a(5) =5226a(6) =54598a(7) =601924a(8) =6985987a(9) =85328266a(10) =1097775922a(11) =14897635468a(12) =213581648046
External references
- oeis: A308650