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 A356426 #25 Sep 07 2022 12:27:24 %S A356426 2,5,11,14,29,32,38,41,83,86,92,95,110,113,119,122,245,248,254,257, %T A356426 272,275,281,284,326,329,335,338,353,356,362,365,731,734,740,743,758, %U A356426 761,767,770,812,815,821,824,839,842,848,851,974,977,983,986,1001,1004,1010,1013,1055,1058 %N A356426 Even bisection of A003278. %C A356426 Complement sequence of A191107 in A003278. %F A356426 a(n) = A003278(2n). %o A356426 (Python) %o A356426 def A356426(n): return int(bin((n<<1)-1)[2:],3)+1 # _Chai Wah Wu_, Sep 07 2022 %Y A356426 Cf. A003278, A191107. %K A356426 nonn %O A356426 1,1 %A A356426 _Arie Bos_, Aug 07 2022