Number of permutations of {1,2,3,...,n} such that no even numbers are adjacent.
A258213
Number of permutations of {1,2,3,...,n} such that no even numbers are adjacent.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =12a(5) =72a(6) =144a(7) =1440a(8) =2880a(9) =43200a(10) =86400a(11) =1814400a(12) =3628800a(13) =101606400a(14) =203212800a(15) =7315660800a(16) =14631321600a(17) =658409472000
External references
- oeis: A258213