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A077014 Number of ways that a directed line (or river) that starts in the South can cross an East-West road n times. +0
2
2, 1, 2, 2, 6, 8, 28, 42, 162, 262, 1076, 1828, 7852, 13820, 61388, 110954, 505878, 933458, 4345660, 8152860, 38608380, 73424650, 352686780, 678390116, 3298016912, 6405031050, 31461151108, 61606881612, 305327366988, 602188541928, 3007925909860, 5969806669034 (list; graph; listen)
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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.


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