Here are the next set of numbers. You should be able to see that these are based on the numbers 1 to 9 and adding ‘Dasa’ / ten.
You can think of ’19’ as being ‘One down from Twenty’
To hear John say the sanskrit number tap on the Play icon on each box
Trini + Dasa = Trayodaśa
3 + 10
Catvari + Dasa = Caturdaśa
4 + 10
Panca + Dasa = Pañcadaśa
5 + 10
Sat + Dasa = śodaśa
6 + 10
Sapta + Dasa = Saptadaśa
7 + 10
Astau + Dasa = Aṣṭādaśa
8 + 10
Eck-ka-na-vim-shi-tahi
(1 down from 20)
vim-shi-tahi