Related to enumeration of sets of non-intersecting circles in the plane.
A281346
Related to enumeration of sets of non-intersecting circles in the plane.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =41a(5) =141a(6) =537a(7) =2041a(8) =8042a(9) =32028a(10) =129780a(11) =531331a(12) =2198502a(13) =9171233a(14) =38545677a(15) =163031436a(16) =693470737a(17) =2964491394a(18) =12729640115a(19) =54881425222a(20) =237471970199
External references
- oeis: A281346