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

Hacker
Rank
Score
781
flag of India
11.11
782
flag of India
11.11
783
flag of India
11.11
787
flag of United States
11.11
789
flag of India
11.11
790
flag of India
11.11
791
flag of India
11.11
792
flag of India
11.11
793
flag of India
11.11
794
flag of India
11.11
795
flag of India
11.11
797
flag of Canada
11.11
800
flag of India
11.11
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