Number of Dyck paths of semilength n having no UUUDDD's starting at level zero; here U=(1,1), D=(1,-1). Also number of Dyck paths of semilength n having no UUDUDD's starting at level zero.
A114500
Number of Dyck paths of semilength n having no UUUDDD's starting at level zero; here U=(1,1), D=(1,-1). Also number of Dyck paths of semilength n having no UUDUDD's starting at level zero.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =37a(6) =119a(7) =390a(8) =1307a(9) =4460a(10) =15452a(11) =54207a(12) =192170a(13) =687386a(14) =2477810a(15) =8992007a(16) =32825653a(17) =120460613a(18) =444125661a(19) =1644324767a(20) =6111002752a(21) =22789116600a(22) =85251100275a(23) =319826371389
External references
- oeis: A114500