Sum of the altitudes of the leftmost valleys of all Dyck paths of semilength n (if path has no valley, then this altitude is taken to be 0).
A143955
Sum of the altitudes of the leftmost valleys of all Dyck paths of semilength n (if path has no valley, then this altitude is taken to be 0).
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =6a(5) =26a(6) =101a(7) =376a(8) =1377a(9) =5017a(10) =18277a(11) =66727a(12) =244377a(13) =898129a(14) =3312554a(15) =12260129a(16) =45526754a(17) =169588754a(18) =633580634a(19) =2373550184a(20) =8914719134a(21) =33562602134a(22) =126640791884a(23) =478848661898
External references
- oeis: A143955