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

Hacker
Rank
Score
641
flag of United Kingdom
22.22
642
flag of India
22.22
644
flag of Republic of Korea
22.22
646
flag of India
22.22
647
flag of Hungary
22.22
650
flag of India
22.22
652
flag of United States
22.22
653
flag of Germany
22.22
654
flag of India
22.22
655
flag of Turkey
22.22
656
flag of India
22.22
657
flag of New Zealand
22.22
658
flag of Germany
22.22
659
flag of Portugal
22.22
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