Number of length n inversion sequences avoiding the patterns 000 and 201 (or 000 and 210).
A374543
Number of length n inversion sequences avoiding the patterns 000 and 201 (or 000 and 210).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =16a(5) =60a(6) =257a(7) =1218a(8) =6270a(9) =34530a(10) =201223a(11) =1230168a(12) =7836622a(13) =51738649a(14) =352457285a(15) =2468427794a(16) =17718840472a(17) =130027678901a(18) =973357030743
External references
- oeis: A374543