Number of 4-noncrossing stack-free partial matching without 1-arcs.
A143657
Number of 4-noncrossing stack-free partial matching without 1-arcs.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =12a(5) =32a(6) =95a(7) =301a(8) =1001a(9) =3495a(10) =12708a(11) =47932a(12) =186581a(13) =747619a(14) =3073207
External references
- oeis: A143657