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 A210344 Meandric numbers for a river crossing up to 16 parallel roads at n points. 18
 1, 1, 2, 4, 10, 23, 63, 155, 448, 1152, 3452, 9158, 28178, 76539, 240370, 665129, 2123439, 5964690, 19302314, 54898380, 179696483 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Number of ways that a river (or directed line) that starts in the South and flows East can cross up to 16 parallel East-West roads n times. Sequence derived from list of solutions described in A206432. LINKS Table of n, a(n) for n=0..20. CROSSREFS Cf. A005316 (sequence for one road; extensive references and links). Cf. A076876 (sequence for two parallel roads). Cf. A204352, A208062, A208126, A208452, A208453, A209383, A209621, A209622, A209626, A209656, A209657, A209660, A209707, A210344, A210478, A210567, A210592 (sequences for 3 to 19 parallel roads). Cf. A206432 (sequence for unlimited number of parallel roads). Cf. A076875, A076906, A076907. Sequence in context: A209657 A209660 A209707 * A210478 A210567 A210592 Adjacent sequences: A210341 A210342 A210343 * A210345 A210346 A210347 KEYWORD nonn,more AUTHOR Robert Price, May 07 2012 STATUS approved

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Last modified September 29 03:24 EDT 2023. Contains 365749 sequences. (Running on oeis4.)