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 A218874 #10 Aug 02 2014 06:14:09 %S A218874 0,0,0,0,0,0,0,0,0,1,2,4,8,18,36,73,146,295,590,1182,2364,4732,9464, %T A218874 18929,37858,75721,151442,302878,605756,1211504,2423008,4845968, %U A218874 9691936,19383784,38767568,77534894,155069788,310139104,620278208,1240555349 %N A218874 (A122536(n)-A003000(n))/2. %C A218874 If a formula or recurrence were known it would explain the mysterious sequence A122536. %C A218874 200 terms are known from the b-files for A122536 and A003000. %H A218874 B. Chaffin, J. P. Linderman, N. J. A. Sloane and Allan Wilks, <a href="http://arxiv.org/abs/1212.6102">On Curling Numbers of Integer Sequences</a>, arXiv:1212.6102, Dec 25 2012. %H A218874 B. Chaffin, J. P. Linderman, N. J. A. Sloane and Allan Wilks, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL16/Sloane/sloane3.html">On Curling Numbers of Integer Sequences</a>, Journal of Integer Sequences, Vol. 16 (2013), Article 13.4.3. %H A218874 <a href="/index/Cu#curling_numbers">Index entries for sequences related to curling numbers</a> %Y A218874 Cf. A122536, A003000. %K A218874 nonn %O A218874 1,11 %A A218874 _N. J. A. Sloane_, Nov 09 2012