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

Hacker
Rank
Score
742
flag of India
22.22
743
flag of India
22.22
745
flag of India
22.22
747
flag of India
22.22

[deleted]

748
flag of null
22.22
749
flag of India
22.22
750
flag of India
22.22
751
flag of Hong Kong
22.22
754
flag of India
22.22
755
flag of India
22.22
756
flag of India
22.22
757
flag of India
22.22
758
flag of Pakistan
22.22
759
flag of India
22.22
760
flag of India
22.22
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