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

Hacker
Rank
Score
482
flag of India
33.33
484
flag of India
33.33
485
flag of India
33.33
488
flag of United States
33.33
489
flag of Sri Lanka
33.33
491
flag of India
33.33
492
flag of United Kingdom
33.33
493
flag of India
33.33
495
flag of Israel
33.33
497
flag of United States
33.33
499
flag of India
33.33
500
flag of India
33.33
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