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

Hacker
Rank
Score
582
flag of India
33.33
584
flag of India
33.33
586
flag of Georgia
22.22
587
flag of United Kingdom
22.22
589
flag of Sri Lanka
22.22
591
flag of India
22.22
592
flag of India
22.22
593
flag of Switzerland
22.22
594
flag of United Kingdom
22.22
596
flag of United Kingdom
22.22
598
flag of Taiwan
22.22
600
flag of Belarus
22.22
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