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

Hacker
Rank
Score
801
flag of Germany
11.11
803
flag of India
11.11
805
flag of Poland
11.11
806
flag of India
11.11
807
flag of India
11.11
808
flag of India
11.11
812
flag of United States
11.11
814
flag of India
11.11
815
flag of India
11.11
816
flag of India
11.11
817
flag of India
11.11
818
flag of India
11.11
819
flag of India
11.11
820
flag of India
11.11
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