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

Hacker
Rank
Score
661
flag of Turkey
22.22
662
flag of United Kingdom
22.22
663
flag of United States
22.22
666
flag of India
22.22
667
flag of India
22.22

[deleted]

668
flag of null
22.22
669
flag of India
22.22
670
flag of India
22.22
671
flag of United States
22.22
673
flag of United States
22.22
674
flag of India
22.22
676
flag of United States
22.22
677
flag of United States
22.22
678
flag of Indonesia
22.22
679
flag of India
22.22
680
flag of Germany
22.22
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