If 12 = 32, 23 = 56, 42 = 68, 51 = 65 then 14 = ?

Question

What is the next number in the sequence -
1, 7, 10, 13, 19, 23, 28, 31, 32, 44, 49, 68, 70, 79, 82, 86, 91, 94, 97, 100, 103, 109, 129, 130, ?

Answer 1

Answer is 54
let's take a digit with 'a' at tens place and 'b' at one's place
so the answer will follow -> (a+b)*10 + (a*b)
so (1+4)*10 + (1*4)
= 5*10 + 4
=54