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

Hacker
Rank
Score
623
flag of United States
22.22
624
flag of Sri Lanka
22.22
625
flag of India
22.22
628
flag of Argentina
22.22
629
flag of India
22.22
630
flag of India
22.22
632
flag of United States
22.22
634
flag of Australia
22.22
635
flag of United States
22.22
636
flag of India
22.22
637
flag of India
22.22
638
flag of Turkey
22.22
639
flag of United States
22.22
640
flag of India
22.22
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