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A077460
Number of nonisomorphic ways a loop can cross a road (running East-West) 2n times.
+0
6
1, 1, 1, 3, 12, 70, 464, 3482, 27779, 233556
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Maintained by
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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.
AT&T Labs Research
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