Number of permutations of [n] in which the length of every increasing run is 0 or 1 (mod 3).
A322251
Number of permutations of [n] in which the length of every increasing run is 0 or 1 (mod 3).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =8a(5) =32a(6) =132a(7) =702a(8) =4566a(9) =31670a(10) =237446a(11) =2010626a(12) =18782106a(13) =187594266a(14) =2009039346a(15) =23200862726a(16) =286250968646
External references
- oeis: A322251