Number of peak plateaux in all Dyck paths of semilength n with no UUU's and no DDD's (U=(1,1), D=(1,-1)).
A166287
Number of peak plateaux in all Dyck paths of semilength n with no UUU's and no DDD's (U=(1,1), D=(1,-1)).
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =3a(5) =8a(6) =21a(7) =53a(8) =133a(9) =334a(10) =839a(11) =2112a(12) =5329a(13) =13475a(14) =34143a(15) =86674a(16) =220400a(17) =561309a(18) =1431522a(19) =3655480a(20) =9345287a(21) =23916622a(22) =61267207a(23) =157088278a(24) =403103955a(25) =1035192885a(26) =2660312103a(27) =6841157380a(28) =17603254230a(29) =45321606641
External references
- oeis: A166287