Since they are all the same, that shows that the sequence is
geometric, and that the common ratio, r=3.

2​, 6​, 18​, 54​, 54∙3=162, 162∙3=486, 486∙3=1458, 1458∙3=4374, 4374∙3=13122

a1 = 2, an+1 = 3∙an for n≥1.

an = a1∙rn-1

an = 2∙3n-1

Edwin