The 2nd integer after the additional function is getting multiplied by a sequence.

1 + (5 x 1) =6

2 + (6 x2) =14

3 + (7 x 3) =24

5 + (1 x 4) =9

a + (b x n) where n is the row number.

Is this allowed?…adding invisible functions & sequences. Concocting solutions to questions that your mind attempts to make sense of.