Number of Dyck paths of semilength n, having no ascents and no descents of length 1, and having no UUDD's starting at level 0.

A166300

Number of Dyck paths of semilength n, having no ascents and no descents of length 1, and having no UUDD's starting at level 0.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =1a(4) =1a(5) =2a(6) =5a(7) =10a(8) =22a(9) =50a(10) =113a(11) =260a(12) =605a(13) =1418a(14) =3350a(15) =7967a(16) =19055a(17) =45810a(18) =110637a(19) =268301a(20) =653066a(21) =1594980a(22) =3907395a(23) =9599326a(24) =23643751a(25) =58374972a(26) =144442170a(27) =358136905a(28) =889671937a(29) =2214015802

External references