Project Euler #173: Using up to one million tiles how many different "hollow" square laminae can be formed?

Hacker
Rank
Score
21
flag of Singapore
100.00
22
flag of Latvia
100.00
23
flag of South Africa
100.00
24
flag of India
100.00
25
flag of Australia
100.00
26
flag of United States
100.00
27
flag of United States
100.00
28
flag of United States
100.00
30
flag of India
100.00
31
flag of Vietnam
100.00
33
flag of United Kingdom
100.00
34
flag of India
100.00
35
flag of Viet Nam
100.00
37
flag of Italy
100.00
38
flag of Bulgaria
100.00
39
flag of Russia
100.00
40
flag of China
100.00
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