Here, pattern is a₃ = a₂(a₁+1) [ for odd place numbers ]
& a₄ = a₃(a₂+2) [ for even place numbers ]
Now, we have 1st number = 2
2nd = 6
3rd = 6(2+1) = 6(3) = 18
4th = 18(6+2) = 18(8) = 144
5th = 144(18+1) = 144(19) = 2736
6th = 2736 (144+2) = 2736(146) = 3,99,456
So, your final answer is 3,99,456
Hope this helps!