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 A316838 #7 Jul 23 2018 09:52:22 %S A316838 1,5,9,13,16,20,24,28,30,34,38,42,45,49,53,57,61,65,69,72,76,80,84,86, %T A316838 90,94,98,101,105,109,113,117,121,124,128,132,136,138,142,146,150,153, %U A316838 157,161,165,169,173,177,180,184,188,192,194,198,202,206,209,213,217,221,224,228,232 %N A316838 Indices of 1's in A254990. %H A316838 Seiichi Manyama, <a href="/A316838/b316838.txt">Table of n, a(n) for n = 1..10000</a> %Y A316838 Cf. A254990, A316837, A316839, A316840. %K A316838 nonn %O A316838 1,2 %A A316838 _N. J. A. Sloane_, Jul 22 2018