The number of permutations p of {1,...,n} such that the numbers 2p(1)-1,...,2p(n)-n are all distinct.
A322859
The number of permutations p of {1,...,n} such that the numbers 2p(1)-1,...,2p(n)-n are all distinct.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =14a(5) =52a(6) =256a(7) =1396a(8) =9064a(9) =62420a(10) =500000a(11) =4250180a(12) =40738880a(13) =410140060a(14) =4572668112a(15) =53214384548a(16) =676739353112
External references
- oeis: A322859