Number of Dyck paths of semilength n having exactly 4 (possibly overlapping) occurrences of the consecutive steps UDUUDU (with U=(1,1), D=(1,-1)).
A243416
Number of Dyck paths of semilength n having exactly 4 (possibly overlapping) occurrences of the consecutive steps UDUUDU (with U=(1,1), D=(1,-1)).
Terms
- a(0) =1a(1) =11a(2) =79a(3) =474a(4) =2561a(5) =12937a(6) =62524a(7) =293146a(8) =1344602a(9) =6065734a(10) =27007870a(11) =118984043a(12) =519589872a(13) =2252141576a(14) =9699519424a(15) =41541816291a(16) =177048628294a(17) =751293699026
External references
- oeis: A243416