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

Hacker
Rank
Score
561
flag of Georgia
22.22
562
flag of United Kingdom
22.22
564
flag of Sri Lanka
22.22
566
flag of India
22.22
567
flag of India
22.22
568
flag of Switzerland
22.22
569
flag of United Kingdom
22.22
571
flag of United Kingdom
22.22
573
flag of Taiwan
22.22
575
flag of Belarus
22.22
576
flag of United Kingdom
22.22
577
flag of India
22.22
578
flag of United States
22.22
579
flag of United States
22.22
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