This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A208357 Number of meanders of order 2n+1 (4*n+2 crossings of the infinite line) with central 1-1 cut. 0
 4, 64, 1764, 68644, 3341584, 190992400, 12310790116, 871343837764, 66469126179600, 5391179227622500 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 REFERENCES S. Lando and A. Zvokin, Plane and projective meanders, Theoret. Comput. Sci. 117 (1993), 227-241. A. Panayotopoulos and P. Tsikouras, The multimatching property of nested sets, Math. & Sci. Hum. 149 (2000), 23-30. A. Panayotopoulos and P. Tsikouras, Properties of meanders, JCMCC 46 (2003), 181-190. A. Panayotopoulos and P. Tsikouras, Meanders and Motzkin words, J. Integer Seq. 7 (2004), Article 04.1.2. A. Panayotopoulos and P. Vlamos, Meandric Polygons, Ars Combinatoria 87 (2008), 147-159. A. Panayotopoulos and P. Vlamos, Cutting Degree of Meanders, Artificial Intelligence Applications and Innovations, IFIP Advances in Information and Communication Technology, Volume 382, 2012, pp 480-489; DOI 10.1007/978-3-642-33412-2_49. - From N. J. A. Sloane, Dec 29 2012 LINKS FORMULA a(n) = b(n)^2 where b(n) = A005315 (with a different offset). CROSSREFS Cf. A005315, A192927, A207851. Sequence in context: A264335 A091483 A263988 * A050636 A098698 A301583 Adjacent sequences:  A208354 A208355 A208356 * A208358 A208359 A208360 KEYWORD nonn AUTHOR Panayotis Vlamos and Antonios Panayotopoulos, Feb 25 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 23 07:20 EDT 2018. Contains 316520 sequences. (Running on oeis4.)