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 A249557 #7 May 01 2019 11:49:44 %S A249557 2,5,10,19,36,59,92,139,202,267,362,485,614,781,868,1041,1248,1475, %T A249557 1730,1987,2266,2601,2964,3359,3806,4205,4672,5185,5712,6195,6698, %U A249557 7313,7948,8643,9378,10053,10800,11579,12418,13297,14196,15039,15966,16925,17908 %N A249557 Indices of even terms in A249064. %H A249557 Lars Blomberg, <a href="/A249557/b249557.txt">Table of n, a(n) for n = 1..261</a> (terms < 10^7) %Y A249557 Cf. A249064. %K A249557 nonn %O A249557 1,1 %A A249557 _N. J. A. Sloane_, Nov 01 2014 %E A249557 More terms from _Lars Blomberg_, May 01 2019