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  1. ciag(N) :- 
  2. (  N = 0
  3. -> X = 0
  4. ;
  5.  (  N = 1
  6.  -> X = 2
  7.  ;  X is ciag(n-1) + 2*ciag(n-2)
  8.   ).
  9.  
Success #stdin #stdout 0.03s 6204KB
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stdin
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ciag(0).
stdout
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Standard output is empty
https://ideone.com/rLsDK
language:
Prolog (swi 7.6.4)
created:
13 years ago
visibility:
public

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