Number of Dyck paths of semilength n and having no UDUD's starting at level 0; here U=(1,1), D=(1,-1).
A127154
Number of Dyck paths of semilength n and having no UDUD's starting at level 0; here U=(1,1), D=(1,-1).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =4a(4) =11a(5) =33a(6) =105a(7) =343a(8) =1148a(9) =3916a(10) =13563a(11) =47571a(12) =168625a(13) =603130a(14) =2174041a(15) =7889617a(16) =28801737a(17) =105696489a(18) =389703392a(19) =1442880489a(20) =5362540760a(21) =19998684400a(22) =74815202891a(23) =280685489717
External references
- oeis: A127154