Number of up-down runs in all permutations of {1,2,...,n}.
A186371
Number of up-down runs in all permutations of {1,2,...,n}.
Terms
- a(0) =0a(1) =1a(2) =3a(3) =13a(4) =68a(5) =420a(6) =3000a(7) =24360a(8) =221760a(9) =2237760a(10) =24796800a(11) =299376000a(12) =3911846400a(13) =55005350400a(14) =828193766400
External references
- oeis: A186371