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A054474
Number of walks on square lattice that start and end at origin after 2n steps, not touching origin at intermediate stages.
+0
8
1, 4, 20, 176, 1876, 22064, 275568, 3584064, 47995476, 657037232, 9150655216, 129214858304, 1845409805168, 26606114089024, 386679996988736, 5658611409163008, 83302885723872852, 1232764004638179504, 18327520881735288432
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Maintained by
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Last modified December 5 23:38 EST 2009. Contains 170428 sequences.
AT&T Labs Research
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