Related to enumeration of sets of non-intersecting circles in the plane.
A281345
Related to enumeration of sets of non-intersecting circles in the plane.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =26a(4) =99a(5) =364a(6) =1417a(7) =5541a(8) =22193a(9) =89799a(10) =368160a(11) =1523020a(12) =6355895a(13) =26713307a(14) =112999390a(15) =480666202a(16) =2054863538a(17) =8823764846a(18) =38042350806a(19) =164609190230a(20) =714613926565
External references
- oeis: A281345