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A077054 Number of ways a river can cross a road 2n times. +0
5
1, 1, 3, 14, 81, 538, 3926, 30694, 252939, 2172830, 19304190, 176343390, 1649008456, 15730575554, 152663683494, 1503962954930, 15012865733351, 151622652413194, 1547365078534578, 15939972379349178, 165597452660771610, 1733609081727968492 (list; graph; listen)
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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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