Number of Dyck paths of semilength n avoiding the pattern U^(n-1) D^(n-1).

A225692

Number of Dyck paths of semilength n avoiding the pattern U^(n-1) D^(n-1).

Terms

    a(0) =0a(1) =0a(2) =4a(3) =25a(4) =106a(5) =392a(6) =1380a(7) =4797a(8) =16714a(9) =58685a(10) =207890a(11) =742755a(12) =2674270a(13) =9694648a(14) =35357444a(15) =129644533a(16) =477638410a(17) =1767262865a(18) =6564120058a(19) =24466266619a(20) =91482563198a(21) =343059613165

External references