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

Hacker
Rank
Score
442
flag of India
100.00
446
flag of Japan
100.00
450
flag of United States
77.78
451
flag of India
55.56
453
flag of Vietnam
44.44
454
flag of Poland
44.44
455
flag of United States
44.44
456
flag of Israel
44.44
457
flag of India
44.44
458
flag of India
44.44
459
flag of Australia
44.44
460
flag of Germany
44.44
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