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 A139357 #27 Jan 06 2023 20:22:54 %S A139357 20,23,1,5,3,4,6,8,9,10,11,12,15,17,18,21,22,26,27,30,31,33,35,36,39, %T A139357 40,43,44,46,48,49,51,54,56,59,60,62,64,65,67,68,69,71,72,75,76,78,79, %U A139357 80,82,84,85,87,88,89,90,93,94,96,97,98,99,101,102,104,105 %N A139357 Sequence describing the positions of the consonants when the sequence is written in French (version 2). %C A139357 The sequence depends on how the initial terms are selected - see the Angelini article for the precise definition. %C A139357 The initial terms are selected such that the sequence starts with 6 even numbers less than 20. - _Tyler Busby_, Jan 01 2023 %H A139357 Eric Angelini, <a href="https://www.pourlascience.fr/sr/article/jeux-de-suites-1637.php">Jeux de suites</a>, in Dossier Pour La Science, pp. 32-35, Volume 59 (Jeux math'), April/June 2008, Paris. %o A139357 (PARI) lista(n) = frconspos([20,23,1,5])(n) %o A139357 /* see A139356 for frconspos() */ %o A139357 \\ _Tyler Busby_, Jan 01 2023 %Y A139357 Cf. A139212, A139356, A139358. %K A139357 nonn,word,easy %O A139357 1,1 %A A139357 _N. J. A. Sloane_ (based on Angelini's article), Jun 08 2008 %E A139357 More terms from _Tyler Busby_, Jan 01 2023