Number of peaks in all hill-free Dyck paths of semilength n (a Dyck path is hill-free if it has no peaks at level 1).
A114515
Number of peaks in all hill-free Dyck paths of semilength n (a Dyck path is hill-free if it has no peaks at level 1).
Terms
- a(0) =0a(1) =0a(2) =1a(3) =3a(4) =12a(5) =45a(6) =171a(7) =651a(8) =2488a(9) =9540a(10) =36690a(11) =141482a(12) =546864a(13) =2118207a(14) =8219967a(15) =31952115a(16) =124389552a(17) =484908408a(18) =1892657934a(19) =7395597354a(20) =28928182440a(21) =113260606074a(22) =443827115886
External references
- oeis: A114515