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A209622 Meandric numbers for a river crossing up to 10 parallel roads at n points. 18
1, 1, 2, 4, 10, 23, 63, 155, 448, 1152, 3452, 9157, 28176, 76514, 240318, 664718, 2122557, 5959052, 19289899, 54828151, 179538447, 515641437, 1705240090, 4941294887, 16481424379, 48127922888, 161736798007, 475487875843, 1608541737898, 4757151493126, 16188528696215 (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 10 parallel East-West roads n times.
Sequence derived from list of solutions described in A206432.
LINKS
CROSSREFS
Cf. A005316 (sequence for one road; extensive references and links).
Cf. A076876 (sequence for two parallel roads).
Cf. A206432 (sequence for unlimited number of parallel roads).
Sequence in context: A208453 A209383 A209621 * A209626 A209656 A209657
KEYWORD
nonn
AUTHOR
Robert Price, May 07 2012
EXTENSIONS
a(21)-a(36) from Andrew Howroyd, Dec 06 2015
STATUS
approved

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)