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

Hacker
Rank
Score
761
flag of Hong Kong
22.22
762
flag of Japan
22.22
763
flag of India
11.11
764
flag of United States
11.11
765
flag of India
11.11
766
flag of India
11.11
767
flag of Germany
11.11
771
flag of India
11.11
772
flag of Germany
11.11
774
flag of India
11.11
776
flag of Poland
11.11
777
flag of India
11.11
778
flag of India
11.11
779
flag of India
11.11
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