Number of ways to place non-intersecting diagonals in convex (n+2)-gon so as to create no quadrilaterals.
A054515
Number of ways to place non-intersecting diagonals in convex (n+2)-gon so as to create no quadrilaterals.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =21a(5) =78a(6) =301a(7) =1198a(8) =4888a(9) =20340a(10) =85986a(11) =368239a(12) =1594183a(13) =6965380a(14) =30675399a(15) =136026759a(16) =606848034a(17) =2721783023a(18) =12265670909a(19) =55511013680a(20) =252193872912
External references
- oeis: A054515