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A210344
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Meandric numbers for a river crossing up to 16 parallel roads at n points.
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18
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1, 1, 2, 4, 10, 23, 63, 155, 448, 1152, 3452, 9158, 28178, 76539, 240370, 665129, 2123439, 5964690, 19302314, 54898380, 179696483
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OFFSET
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0,3
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COMMENTS
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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.
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LINKS
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Table of n, a(n) for n=0..20.
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CROSSREFS
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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
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KEYWORD
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nonn,more
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AUTHOR
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Robert Price, May 07 2012
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STATUS
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approved
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