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Apr 21st, 2015
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  1. Tr_i(n){
  2. if(n<=1) return(0);
  3. if(n=2) return(1);
  4. a=0
  5. b=1
  6. c=1
  7. for(i=1;i<=n-3;i++){
  8. d=a+b+c;
  9. a=b;
  10. b=c;
  11. c=d;
  12. }
  13. return c;
  14. }
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