Number of Dyck n-paths all of whose ascents and descents have lengths equal to 1 (mod 5).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =4a(8) =7a(9) =11a(10) =16a(11) =23a(12) =35a(13) =57a(14) =96a(15) =161a(16) =264a(17) =425a(18) =682a(19) =1106a(20) =1821a(21) =3030a(22) =5055a(23) =8412a(24) =13956a(25) =23145a(26) =38487a(27) =64261a(28) =107673a(29) =180762