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

Hacker
Rank
Score
724
flag of Germany
22.22
725
flag of India
22.22
726
flag of India
22.22
727
flag of India
22.22
730
flag of India
22.22

[deleted]

733
flag of Cuba
22.22
734
flag of India
22.22
735
flag of India
22.22
736
flag of India
22.22
737
flag of India
22.22
738
flag of Pakistan
22.22
739
flag of Canada
22.22
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