Number left factors of Dyck paths of length n and having no hills; a hill is a (1,1)-step starting at level 0 and followed by a (1,-1)-step.
A191526
Number left factors of Dyck paths of length n and having no hills; a hill is a (1,1)-step starting at level 0 and followed by a (1,-1)-step.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =7a(6) =13a(7) =24a(8) =46a(9) =86a(10) =166a(11) =314a(12) =610a(13) =1163a(14) =2269a(15) =4352a(16) =8518a(17) =16414a(18) =32206a(19) =62292a(20) =122464a(21) =237590a(22) =467842a(23) =909960a(24) =1794196a(25) =3497248a(26) =6903352a(27) =13480826a(28) =26635774a(29) =52097267
External references
- oeis: A191526