Crossing matchings: linear chord diagrams with 2n nodes and n arcs in which each arc crosses another arc.
A081054
Crossing matchings: linear chord diagrams with 2n nodes and n arcs in which each arc crosses another arc.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =4a(4) =31a(5) =288a(6) =3272a(7) =43580a(8) =666143a(9) =11491696a(10) =220875237a(11) =4681264432a(12) =108475235444
External references
- oeis: A081054