Number of permutations of {1,2,3,...,n} such that no multiples of 3 are adjacent.
A258216
Number of permutations of {1,2,3,...,n} such that no multiples of 3 are adjacent.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =480a(7) =3600a(8) =30240a(9) =151200a(10) =1693440a(11) =20321280a(12) =121927680a(13) =1828915200a(14) =28740096000a(15) =201180672000
External references
- oeis: A258216