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

Hacker
Rank
Score
621
flag of India
22.22
622
flag of Hungary
22.22
625
flag of India
22.22
627
flag of United States
22.22
628
flag of Germany
22.22
629
flag of India
22.22
630
flag of Turkey
22.22
631
flag of India
22.22
632
flag of New Zealand
22.22
633
flag of Germany
22.22
634
flag of Portugal
22.22
636
flag of India
22.22
637
flag of India
22.22
639
flag of United States
22.22
640
flag of Russia
22.22
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