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 A060149 #10 Feb 07 2025 19:36:04 %S A060149 1,3,2,13,16,106,166,1073,1934,12142,24076,147090,312906,1865772, %T A060149 4191822,24463905,57433950,328887346,800740450,4508608610,11319707546, %U A060149 62781858592,161841539812,885513974674,2335765140994,12624162072740,33979681977530,181611275997040 %N A060149 Number of homogeneous generators of degree n for graded algebra associated with meanders. %H A060149 Andrew Howroyd, <a href="/A060149/b060149.txt">Table of n, a(n) for n = 1..1000</a> %H A060149 Roland Bacher, <a href="https://www-fourier.ujf-grenoble.fr/sites/default/files/ref_478.pdf">Meander algebras</a> %F A060149 G.f.: 1 - 1/B(x) where B(x) is the g.f. of A018224. - _Andrew Howroyd_, Feb 07 2025 %o A060149 (PARI) seq(n) = Vec(1 - 1/sum(k=0, n, binomial(k, k\2)^2*x^k, O(x*x^n))) \\ _Andrew Howroyd_, Feb 07 2025 %Y A060149 Meander sequences in Bacher's paper: A005315, A060066, A060089, A060111, A060148, A060149, A060174, A060198, A060206. %Y A060149 Cf. A018224. %K A060149 nonn %O A060149 1,2 %A A060149 _N. J. A. Sloane_, Apr 10 2001 %E A060149 a(11) onwards from _Andrew Howroyd_, Feb 07 2025