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

Hacker
Rank
Score
762
flag of Bangladesh
22.22
764
flag of Hong Kong
22.22
765
flag of Japan
22.22
767
flag of India
11.11
768
flag of United States
11.11
769
flag of India
11.11
770
flag of India
11.11
771
flag of Germany
11.11
775
flag of India
11.11
776
flag of Germany
11.11
778
flag of India
11.11
780
flag of Poland
11.11
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