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

Hacker
Rank
Score
661
flag of India
22.22
662
flag of India
22.22
664
flag of United States
22.22
665
flag of Russia
22.22
666
flag of United Kingdom
22.22
667
flag of India
22.22
670
flag of Singapore
22.22
671
flag of Cyprus
22.22
672
flag of South Africa
22.22
674
flag of United States
22.22
676
flag of India
22.22
677
flag of Canada
22.22
678
flag of United States
22.22
679
flag of India
22.22
680
flag of United States
22.22
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