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 A249598 #17 Feb 06 2015 02:50:31 %S A249598 1,18,279,4,68985,1094166,49,264,1053,1050,4191,17966487875148,65, %T A249598 266910,73278909191113155,16,18722068612123127013, %U A249598 299304917928357795234,265639,76514292380672732576340,1223491190935287357533961,67880230,1035,17360709912,775 %N A249598 Analog of A097717 in base 4. %H A249598 Lars Blomberg, <a href="/A249598/b249598.txt">Table of n, a(n) for n = 1..830</a> %e A249598 279 is (10113)_4 which shift-rotates into (01131)_4 = 93 = 279/3, so 279 qualifies as a(3). %Y A249598 Cf. A094676, A249596, A249598, A249599. %K A249598 nonn,base %O A249598 1,2 %A A249598 _R. J. Mathar_, Mar 30 2009, Nov 11 2014 %E A249598 a(12)-a(25) from _Lars Blomberg_, Feb 04 2015