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  1. def f(n,x,y):
  2. 	if n==2:
  3. 		if x==0==y: return 1
  4. 		return 0
  5. 	s=0
  6. 	for dx in [1,-1]:
  7. 		for dy in [1,-1]:
  8. 			s+=f(n+1,x+dx,y+dy)
  9. 	s+=4*f(n+1,x,y)
  10. 	return s
  11.  
  12. print f(0,0,0)
Success #stdin #stdout 0.01s 7692KB
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20
https://ideone.com/UwHdfP
language:
Python (cpython 2.7.16)
created:
8 years ago
visibility:
secret

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