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 A060827 #8 Dec 15 2017 17:35:00 %S A060827 2,2,2,4,6,10,12,22,28,50,62,112,140,252,314,566,706,1272,1586,2858, %T A060827 3564,6422,8008,14430,17994,32424,40432,72856,90850,163706,204138, %U A060827 367844,458694,826538,1030676,1857214,2315908,4173122,5203798,9376920 %N A060827 3-wave sequence beginning with 2's. %C A060827 The 3-wave sequence with initial values a, b, c is formed by the following construction: %C A060827 a.......a+b+c............3a+5b+6c... %C A060827 ..b...b+c...a+2b+2c..2a+4b+5c... %C A060827 ....c..........a+2b+3c... %C A060827 Dropping middle row gives A052994. %H A060827 F. v. Lamoen, <a href="http://home.wxs.nl/~lamoen/wiskunde/wave.htm">Wave sequences</a> %H A060827 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (0,2,0,1,0,-1). %F A060827 G.f.: (-2x^2+2x+2)/(x^6-x^4-2x^2+1). %F A060827 a(n) = 2*A038196(n). %Y A060827 Cf. A038196, A052994 (bisection) %K A060827 easy,nonn %O A060827 0,1 %A A060827 _Jason Earls_, Apr 30 2001 %E A060827 More terms from Larry Reeves (larryr(AT)acm.org), May 10 2001