1. a1=3, a2=−9, a3=−21, a4=−33, a5=−45; arithmetic sequence
2. a1=−6, a2=−12, a3=−24, a4=−48, a5=−96; geometric sequence
3. a1=−2, a2=−1, a3=2, a4=11, a5=38
4. 1n
5. a7=21
6. a8=−13128
7. 590
8. 93128
9. 211
10. 1
11. 16x4−32x3+24x2−8x+1
12. 8x
13. 1024
14. 72
15. 21
16. 60
17. 6,760,000
18. 512
19. 56
20. 751
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