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

A102407

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

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =26a(6) =72a(7) =206a(8) =606a(9) =1820a(10) =5558a(11) =17206a(12) =53872a(13) =170298a(14) =542778a(15) =1742308a(16) =5627698a(17) =18277698a(18) =59652952a(19) =195541494a(20) =643506310a(21) =2125255036a(22) =7041631854a(23) =23400092142a(24) =77971706848a(25) =260458050034a(26) =872040564850

External references