not maths

[willpig]

Allowing a small amount of latitude what comes next in this non mathematical sequence-

13  10  15  11  12  23  6  1 ?

[grandpapa]

Is the following seqence correct ?

13 10 15 11 12 23 6 (1)

(1) 24 3 25 26 11 20 15

I will post the detailed justifications after I am sure it is correct.