Number of Dyck n-paths all of whose ascents and descents have lengths equal to 1 (mod 9).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =2a(11) =4a(12) =7a(13) =11a(14) =16a(15) =22a(16) =29a(17) =37a(18) =46a(19) =57a(20) =73a(21) =99a(22) =142a(23) =211a(24) =317a(25) =473a(26) =694a(27) =997a(28) =1402a(29) =1937