Number of length n inversion sequences avoiding the patterns 000 and 120.
A374552
Number of length n inversion sequences avoiding the patterns 000 and 120.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =50a(6) =185a(7) =737a(8) =3126a(9) =13976a(10) =65426a(11) =318699a(12) =1607800a(13) =8368088a(14) =44791046a(15) =245903077a(16) =1381505822a(17) =7926881015a(18) =46373681595a(19) =276193339071
External references
- oeis: A374552