Number of anti-down steps in all modified skew Dyck paths of semilength n.

A274405

Number of anti-down steps in all modified skew Dyck paths of semilength n.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =6a(5) =34a(6) =179a(7) =915a(8) =4607a(9) =22988a(10) =114090a(11) =564359a(12) =2785921a(13) =13735074a(14) =67665208a(15) =333211828a(16) =1640575047a(17) =8077199130a(18) =39770520844a(19) =195852723348a(20) =964689515033

External references