Number of UU's starting at level 0 in all skew Dyck paths of semilength n.

A129169

Number of UU's starting at level 0 in all skew Dyck paths of semilength n.

Terms

    a(0) =0a(1) =0a(2) =2a(3) =9a(4) =37a(5) =153a(6) =643a(7) =2745a(8) =11881a(9) =52038a(10) =230268a(11) =1028007a(12) =4625013a(13) =20949444a(14) =95462022a(15) =437318631a(16) =2012933893a(17) =9304997544a(18) =43179620542a(19) =201076887771a(20) =939358727203

External references