a(n) is the total number of down steps between the first and second up steps in all 4_1-Dyck paths of length 5*n.
A334651
a(n) is the total number of down steps between the first and second up steps in all 4_1-Dyck paths of length 5*n.
Terms
- a(0) =0a(1) =7a(2) =25a(3) =155a(4) =1195a(5) =10282a(6) =94591a(7) =910480a(8) =9054965a(9) =92310075a(10) =959473878a(11) =10129715890a(12) =108327387675
External references
- oeis: A334651