Fill in the blanks of summation sequence: 1,1,1,2,3,5,9, () Fill in the blanks of summation sequence: 1,1,1,2,3,5,9, () What number should be filled in () please? Please write a solution process, thank you

sixteen
1+1+1-1=2
1+1+2-1=3
1+2+3-1=5
2+3+5-1=9
3+5+9-1=16

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