Place n equally spaced points on each side of an equilateral triangle, and join each of these points by a chord to the 2*n new points on the other two sides: sequence gives number of regions in the resulting planar graph.
A366486
Place n equally spaced points on each side of an equilateral triangle, and join each of these points by a chord to the 2*n new points on the other two sides: sequence gives number of regions in the resulting planar graph.
Terms
- a(0) =1a(1) =4a(2) =27a(3) =130a(4) =385a(5) =1044a(6) =2005a(7) =4060a(8) =6831a(9) =11272a(10) =16819a(11) =26436a(12) =35737a(13) =52147a(14) =69984a(15) =92080a(16) =117952a(17) =157770a(18) =193465a(19) =249219a(20) =302670a(21) =368506a(22) =443026a(23) =546462a(24) =635125a(25) =757978a(26) =890133a(27) =1041775a(28) =1191442a(29) =1407324
External references
- oeis: A366486