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f=lambda n:[0][n:]or[i+j*2for i in 0,1for j in f(n-1)]
 
for n in range(4):
	print '%d -> %s' % (n,f(n))

Success #stdin #stdout 0.01s 9016KB

stdin

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Standard input is empty

stdout

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0 -> [0]
1 -> [0, 1]
2 -> [0, 2, 1, 3]
3 -> [0, 4, 2, 6, 1, 5, 3, 7]

https://ideone.com/Smw0nC

language:

Python (cpython 2.7.16)

created:

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secret

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