Number of LD's in all skew Dyck paths of semilength n.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =8a(5) =48a(6) =261a(7) =1358a(8) =6907a(9) =34684a(10) =172850a(11) =857389a(12) =4240442a(13) =20933422a(14) =103221134a(15) =508623877a(16) =2505298946a(17) =12338127048a(18) =60761615904a(19) =299256606347