No of nodes, n =15

rhod=2d=3d=4d=5d=6d=7d=8d=9d=10d=11d=12d=13d=14
215-30-45-60-75-90-105
310152025303540455055606570
4--15---30---45--
5691215182124273033363942
6--10-15-20-25-30-35
7-----15------30
8------15------
9----10--15--20--
10--6-9-12-15-18-21
11---------15---
12------10---15--
13-----------15-
14------------15