Number of permutations of [n] with exactly one occurrence of the consecutive step pattern up, down, up.
A227883
Number of permutations of [n] with exactly one occurrence of the consecutive step pattern up, down, up.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =5a(5) =50a(6) =328a(7) =2154a(8) =16751a(9) =144840a(10) =1314149a(11) =12735722a(12) =134159743a(13) =1519210786a(14) =18272249418a(15) =233231701166
External references
- oeis: A227883