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 A109740 #6 Apr 25 2023 13:07:19 %S A109740 1,2,3,5,9,17,33,65,87,129,153,229,257,321,481,641,769,785,1025,1281, %T A109740 1425,1793,1889,2049,2561,3329,3857,3937,4097,8193,10241,10849,14337, %U A109740 14849,15681,18273,20321,22369,22529,27905,31489,31745,38913 %N A109740 Where records appear in A109734. %Y A109740 Cf. A109734. %K A109740 nonn %O A109740 1,2 %A A109740 _N. J. A. Sloane_, Aug 11 2005 %E A109740 More terms from _T. D. Noe_, Aug 11 2005