Number of UUDUDD's starting at level 0 in all Dyck paths of semilength n with no UUU's and no DDD's (U=(1,1), D=(1,-1)).

A166297

Number of UUDUDD's starting at level 0 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) =2a(5) =5a(6) =12a(7) =28a(8) =66a(9) =156a(10) =370a(11) =882a(12) =2112a(13) =5079a(14) =12264a(15) =29725a(16) =72298a(17) =176414a(18) =431754a(19) =1059595a(20) =2607090a(21) =6429913a(22) =15893330a(23) =39365876a(24) =97692372a(25) =242875105a(26) =604836072a(27) =1508619585a(28) =3768496102a(29) =9426815859

External references