cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A217318 The number of meandering curves of order n, with both extremity covered by its arcs.

Original entry on oeis.org

0, 0, 0, 1, 10, 20, 156, 273, 1986, 3358, 23742, 39736, 277178, 462794, 3205896, 5355743, 36963722, 61856394, 426075994, 714515312, 4916833424, 8263479072, 56840484232, 95733461792, 658460090994, 1111253958664, 7644360501390, 12925362323004, 88938175307354
Offset: 1

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Author

Panayotis Vlamos, Antonios Panayotopoulos, and Georgia Theocharopoulou, Mar 18 2013

Keywords

Comments

A meandering curve of order n is a continuous curve which does not intersect itself yet intersects a horizontal line n times.

References

  • A. Panayotopoulos and P. Tsikouras, Properties of meanders, JCMCC 46 (2003), 181-190.

Crossrefs

Cf. A005315.

Formula

a(n) = A223095(n) * A000034(n) / 2. - Andrew Howroyd, Dec 06 2015
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