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 A060824 #16 Dec 15 2017 17:35:00 %S A060824 2,2,2,2,4,6,8,14,18,20,38,52,60,112,150,170,320,432,492,924,1244, %T A060824 1414,2658,3582,4074,7656,10314,11728,22042,29698,33772,63470,85512, %U A060824 97240,182752,246222,279994,526216,708968,806208,1515176,2041392,2321386 %N A060824 4-wave sequence beginning with 2s. %C A060824 Primes are the numbers >=2 which have no nontrivial divisor: a(p)=0. %C A060824 Also: a(n)= A032741(n)-1, n>=2 (from number of divisors <n, called proper divisors). %H A060824 F. v. Lamoen, <a href="http://home.wxs.nl/~lamoen/wiskunde/wave.htm">Wave sequences</a> %H A060824 <a href="/index/Rec#order_11">Index entries for linear recurrences with constant coefficients</a>, signature (1, -1, 3, -3, 3, 0, 0, 0, -1, 1, -1). %F A060824 a(n) = 2*A038197(n-2). %F A060824 a(n)=2*a(n-3)+3*a(n-6)-a(n-9)-a(n-12) - Antonio G. Astudillo (afg_astudillo(AT)hotmail.com), Jan 12 2003 %F A060824 G.f.: -2*x^2*(x^5-2*x^4+2*x^3-x^2-1)/((x^2-x+1)*(x^9-3*x^3+1)). - _Colin Barker_, Nov 09 2012 %Y A060824 Cf. A038197. %K A060824 easy,nonn %O A060824 2,1 %A A060824 _Jason Earls_, May 01 2001