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 A060111 #20 Feb 07 2025 19:38:48 %S A060111 1,4,15,56,207,764,2805,10288,37609,137380,500655,1823440,6629423, %T A060111 24090332,87418221,317085352,1148825185,4160744164,15054719697, %U A060111 54454345624,196805925995,711077858188,2567375653681,9267176552040,33430012251123,120565130387572,434578910451203 %N A060111 Dimensions of graded algebra associated with meanders. %C A060111 Number of meander slices with n crossings which can be open on both sides and contain no closed loops. These are called open meandric systems in the Bobier and Sawada reference. - _Andrew Howroyd_, Feb 07 2025 %H A060111 Andrew Howroyd, <a href="/A060111/b060111.txt">Table of n, a(n) for n = 0..40</a> (terms 0..27 from B. Bobier and J. Sawada) %H A060111 Roland Bacher, <a href="https://www-fourier.ujf-grenoble.fr/sites/default/files/ref_478.pdf">Meander algebras</a>, Institut Fourier, UMR 5582, Laboratoire de Mathématiques, 1999. %H A060111 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. [The final term for a(28) is incorrect]. %Y A060111 Meander sequences in Bacher's paper: A005315, A060066, A060089, A060111, A060148, A060149, A060174, A060198, A060206. %K A060111 nonn %O A060111 0,2 %A A060111 _N. J. A. Sloane_, Apr 10 2001 %E A060111 More terms from Larry Reeves (larryr(AT)acm.org), Apr 26 2001