sequences and series

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Across
  1. 5. 5,7,21,8,6,9,3
  2. 9. an=3+(n-1)4
  3. 10. 2+4+8+16=32
Down
  1. 1. 2,4,8,16
  2. 2. an=r*an-1
  3. 3. 1+2+3+4=10
  4. 4. an=an-1=d
  5. 6. an=a1r^n-1
  6. 7. 1,2,3,4,5,6,7,8,9,10
  7. 8. 1+1/2+1/4+1/8+1/16+1/32+...