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

Terms

a(0) =0a(1) =0a(2) =0a(3) =4a(4) =28a(5) =157a(6) =820a(7) =4155a(8) =20742a(9) =102725a(10) =506504a(11) =2491230a(12) =12236520a(13) =60063399a(14) =294748884a(15) =1446436680a(16) =7099442700a(17) =34855583275a(18) =171187439920a(19) =841084246980