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

Hacker
Rank
Score
681
flag of India
22.22
682
flag of Germany
22.22
683
flag of Greece
22.22
685
flag of United States
22.22
686
flag of India
22.22
687
flag of India
22.22
688
flag of India
22.22
689
flag of Poland
22.22
690
flag of India
22.22
692
flag of Turkey
22.22
693
flag of United States
22.22
694
flag of Marshall Islands
22.22
695
flag of India
22.22
699
flag of Germany
22.22
700
flag of India
22.22
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