5+8=13=>13*2=26

Similarly

1+4=5=>5*2=10

So 10 will be the next sequence.

58 (5+8)*2=26 (2+6)*2=16 (1+6)*2=14 (1+4)*2=10

So answer is 10

find the next number in following series: 16,21,26,26,12,??