Find the next three terms of this sequence : 128; 61; Y; 64; 63; S; 32; 65; N; 16; 67; J; 8; 69; G

Answer 1

4; 71; E

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Explanation- by dividing the series into 3 columns we can see how each column is formed as below and find next line:
128; 61; Y; (Y=25)
64; 63; S; (S=19--> -6)
32; 65; N; (N=14--> -5)
16; 67; J; (J=10--> -4)
8; 69; G (G=7--> -3)
4; 71; E (E=5--> -2)