No of nodes, n =18

rhod=2d=3d=4d=5d=6d=7d=8d=9d=10d=11d=12d=13d=14d=15d=16d=17
218273645546372819099108117126135144153
3121824303642485460667278849096102
49-18-27-36-45-54-63-72-
5---18----36----54--
6-91215182124273033363942454851
7-----18------36---
8--9---18---27---36-
9-6810121416182022242628303234
10---9----18----27--
11---------18------
12----9-12-15-18-21-24-
13-----------18----
14-----9------18---
15--------12----18--
16--------------18-
17---------------18