Number of ways to lace a shoe that has n pairs of eyelets such that the lace does not cross itself between the eyelet rows.
A079410
Number of ways to lace a shoe that has n pairs of eyelets such that the lace does not cross itself between the eyelet rows.
Terms
- a(0) =2a(1) =7a(2) =54a(3) =308a(4) =2890a(5) =25764
External references
- oeis: A079410