Number of linear chord diagrams with n+2 chords such that every chord has length at least n.

A293156

Number of linear chord diagrams with n+2 chords such that every chord has length at least n.

Terms

    a(0) =15a(1) =36a(2) =99a(3) =292a(4) =876a(5) =2628a(6) =7884a(7) =23652a(8) =70956a(9) =212868a(10) =638604a(11) =1915812a(12) =5747436a(13) =17242308a(14) =51726924a(15) =155180772a(16) =465542316a(17) =1396626948a(18) =4189880844a(19) =12569642532a(20) =37708927596a(21) =113126782788a(22) =339380348364

External references