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

Hacker
Rank
Score
741
flag of Germany
22.22
742
flag of Netherlands
22.22
743
flag of India
22.22
744
flag of Taiwan
22.22
745
flag of Singapore
22.22
746
flag of India
22.22
747
flag of India
22.22
748
flag of India
22.22
749
flag of India
22.22
750
flag of India
22.22
751
flag of India
22.22
754
flag of India
22.22
755
flag of India
22.22
757
flag of India
22.22
759
flag of India
22.22

[deleted]

760
flag of null
22.22
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