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 A091411 #18 Aug 19 2025 09:42:28 %S A091411 1,3,9,19,47,98,220,441,885,1771,3551,7106,14279,28559,57121,114243, %T A091411 228495,456994,914012,1828025,3656053,7312107,14624223,29248450, %U A091411 58497096,116994195,233988391,467976791,935953586,1871907196 %N A091411 Lengths of the B blocks in analysis of A090822. %C A091411 Also, values of len_y(n) when len_x(n) = 0 in A090822. %H A091411 Fokko J. van de Bult, Dion C. Gijswijt, John P. Linderman, N. J. A. Sloane, and Allan R. Wilks, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL10/Sloane/sloane55.html">A Slow-Growing Sequence Defined by an Unusual Recurrence</a>, J. Integer Sequences, Vol. 10 (2007), #07.1.2. %H A091411 Fokko J. van de Bult, Dion C. Gijswijt, John P. Linderman, N. J. A. Sloane, and Allan R. Wilks, A Slow-Growing Sequence Defined by an Unusual Recurrence [<a href="http://neilsloane.com/doc/gijs.pdf">pdf</a>, <a href="http://neilsloane.com/doc/gijs.ps">ps</a>]. %H A091411 Levi van de Pol, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL28/Vandepol/vandepol5.html">The Growth Rate of Gijswijt's Sequence</a>, J. Int. Seq. (2025) Vol. 28, Art. No. 25.4.6. %H A091411 <a href="/index/Ge#Gijswijt">Index entries for sequences related to Gijswijt's sequence</a> %F A091411 a(1) = 1; for n > 1, a(n+1) = 2*a(n) + A091579(n). %F A091411 This roughly doubles at each step and a(n) -> 1.743349432191828... * 2^n. %Y A091411 Cf. A090822, A091579, A091410, A095828. %K A091411 nonn %O A091411 1,2 %A A091411 _N. J. A. Sloane_, Mar 04 2004 %E A091411 14279 and 28559 from _Allan Wilks_, Mar 04 2004 %E A091411 Extended by _N. J. A. Sloane_, Mar 06 2004