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.
%I A060089 #24 Feb 07 2025 19:38:54 %S A060089 1,1,3,7,23,63,213,627,2149,6597,22787,71883,249523,802291,2794365, %T A060089 9111917,31814061,104862813,366796437,1219313185,4271041447, %U A060089 14295561451,50131159253,168742700865,592279599483,2003050663889,7035894016347,23890177457535,83968962295531 %N A060089 Dimensions of graded algebra associated with meanders (subalgebra version). %C A060089 Number of meander slices with n crossings which are closed on one side and contain no closed loops. These are called unidirectional open meandric systems in the Bobier and Sawada reference. - _Andrew Howroyd_, Feb 07 2025 %H A060089 Andrew Howroyd, <a href="/A060089/b060089.txt">Table of n, a(n) for n = 0..40</a> (terms 0..28 from B. Bobier and J. Sawada) %H A060089 Roland Bacher, <a href="https://www-fourier.ujf-grenoble.fr/?q=en/content/meander-algebras">Meander algebras</a>, Institut Fourier, UMR 5582, Laboratoire de Mathématiques, 1999. %H A060089 B. Bobier and J. Sawada, <a href="http://www.cis.uoguelph.ca/~sawada/papers/meander.pdf">A fast algorithm to generate open meandric systems and meanders</a>, Transactions on Algorithms, Vol. 6 No. 2 (2010) article #42, 12 pages. %Y A060089 Meander sequences in Bacher's paper: A005315, A060066, A060089, A060111, A060148, A060149, A060174, A060198, A060206. %K A060089 nonn %O A060089 0,3 %A A060089 _N. J. A. Sloane_, Apr 10 2001 %E A060089 More terms from Larry Reeves (larryr(AT)acm.org), Apr 26 2001 %E A060089 Further terms from the Bobier-Sawada paper, Jul 28 2007