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 A139358 #11 Jan 06 2023 20:22:21 %S A139358 12,4,6,10,14,18,1,9,15,17,21,23,24,26,28,29,32,34,35,38,39,42,43,45, %T A139358 47,48,50,51,52,54,55,56,58,60,61,63,64,65,66,67,70,71,73,74,75,76,79, %U A139358 80,82,84,85,86,87,89,90,92,93,94,95,98,99,101,102,103,104 %N A139358 A non-monotonic analog of A139212 in which the sequence describes the positions of the consonants when the sequence is written in French (version 3). %C A139358 The sequence depends on how the initial terms are selected - see the Angelini article for the precise definition. %C A139358 The initial terms are selected such that the sequence starts with 6 even numbers less than 20. - _Tyler Busby_, Jan 06 2023 %H A139358 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 A139358 (PARI) lista(n) = frconspos([12, 4, 6, 10, 14, 18])(n) %o A139358 /* see A139356 for frconspos() */ %o A139358 \\ _Tyler Busby_, Jan 06 2023 %Y A139358 Cf. A139212, A139356, A139357. %K A139358 nonn,word,easy %O A139358 1,1 %A A139358 _N. J. A. Sloane_ (based on Angelini's article), Jun 08 2008 %E A139358 More terms from _Tyler Busby_, Jan 06 2023