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
645
flag of Singapore
22.22
646
flag of Cyprus
22.22
647
flag of South Africa
22.22
649
flag of United States
22.22
651
flag of India
22.22
652
flag of Canada
22.22
653
flag of United States
22.22
654
flag of India
22.22
655
flag of United States
22.22
657
flag of India
22.22
658
flag of India
22.22
660
flag of India
22.22
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