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

Hacker
Rank
Score
721
flag of Netherlands
22.22
722
flag of India
22.22
723
flag of Taiwan
22.22
724
flag of Singapore
22.22
725
flag of India
22.22
726
flag of India
22.22
727
flag of India
22.22
728
flag of India
22.22
729
flag of India
22.22
730
flag of India
22.22
733
flag of India
22.22
734
flag of India
22.22
736
flag of India
22.22
738
flag of India
22.22

[deleted]

739
flag of null
22.22
740
flag of India
22.22
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