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A005315 Closed meandric numbers (or meanders): ways a loop can cross a road 2n times.
(Formerly M1862)
+0
20
1, 1, 2, 8, 42, 262, 1828, 13820, 110954, 933458, 8152860, 73424650, 678390116, 6405031050, 61606881612, 602188541928, 5969806669034, 59923200729046, 608188709574124, 6234277838531806, 64477712119584604, 672265814872772972, 7060941974458061392 (list; graph; listen)
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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.


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