Number of Dyck paths of semilength n having exactly 2 (possibly overlapping) occurrences of the consecutive steps UDUUDU (with U=(1,1), D=(1,-1)).
A243414
Number of Dyck paths of semilength n having exactly 2 (possibly overlapping) occurrences of the consecutive steps UDUUDU (with U=(1,1), D=(1,-1)).
Terms
- a(0) =1a(1) =7a(2) =34a(3) =149a(4) =627a(5) =2584a(6) =10529a(7) =42606a(8) =171563a(9) =688255a(10) =2752912a(11) =10985005a(12) =43747708a(13) =173937910a(14) =690592594a(15) =2738547328a(16) =10848121023a(17) =42931655341a(18) =169759128539a(19) =670744883641
External references
- oeis: A243414