This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A210567 Meandric numbers for a river crossing up to 18 parallel roads at n points. 18
 1, 1, 2, 4, 10, 23, 63, 155, 448, 1152, 3452, 9158, 28178, 76539, 240370, 665129, 2123439, 5964691, 19302316, 54898416, 179696557 (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 18 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. 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: A209707 A210344 A210478 * A210592 A206432 A124480 Adjacent sequences:  A210564 A210565 A210566 * A210568 A210569 A210570 KEYWORD nonn,more AUTHOR Robert Price, May 07 2012 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 12 15:11 EST 2019. Contains 329960 sequences. (Running on oeis4.)