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

Hacker
Rank
Score
761
flag of India
22.22
762
flag of India
22.22
763
flag of Hong Kong
22.22
766
flag of India
22.22
767
flag of India
22.22
768
flag of India
22.22
769
flag of India
22.22
770
flag of Pakistan
22.22
771
flag of India
22.22
772
flag of India
22.22
773
flag of United States
22.22
776
flag of India
22.22
777
flag of United States
22.22
778
flag of United States
22.22
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