Number of Dyck paths of semilength n having no ascents of length 1 that start at an even level.

A102406

Number of Dyck paths of semilength n having no ascents of length 1 that start at an even level.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =2a(4) =5a(5) =14a(6) =39a(7) =114a(8) =339a(9) =1028a(10) =3163a(11) =9852a(12) =31005a(13) =98436a(14) =314901a(15) =1014070a(16) =3284657a(17) =10694314a(18) =34979667a(19) =114887846a(20) =378750951a(21) =1252865288a(22) =4157150327a(23) =13832926200a(24) =46148704121a(25) =154327715592a(26) =517236429545

External references