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

Hacker
Rank
Score
682
flag of India
22.22
683
flag of India
22.22
685
flag of India
22.22
686
flag of United States
22.22
687
flag of India
22.22
688
flag of Turkey
22.22
689
flag of United Kingdom
22.22
690
flag of United States
22.22
693
flag of India
22.22
694
flag of India
22.22

[deleted]

695
flag of null
22.22
696
flag of India
22.22
697
flag of India
22.22
698
flag of United States
22.22
700
flag of United States
22.22
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