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

Hacker
Rank
Score
721
flag of India
22.22
722
flag of India
22.22
723
flag of India
22.22
724
flag of India
22.22
725
flag of India
22.22
726
flag of India
22.22
729
flag of India
22.22
730
flag of India
22.22
732
flag of India
22.22
734
flag of India
22.22

[deleted]

735
flag of null
22.22
736
flag of India
22.22
737
flag of India
22.22
738
flag of Hong Kong
22.22
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