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 A210609 #24 Apr 10 2014 00:15:34 %S A210609 0,0,0,1,1,1,1,2,2,3,3,4,4,5,5,6,6,6,6,7,7,8,14,21,27 %N A210609 Number of intersections after n-th stage in the structure mentioned in A210606 using semicircumferences and counting the superposed intersections only once. %C A210609 The structure mentioned in A210606 is a model for the visualization of Recamán's sequence A005132. %C A210609 First differs from A210608 at a(24). %H A210609 <a href="/index/Rea#Recaman">Index entries for sequences related to Recamán's sequence</a> %Y A210609 Cf. A005132, A064289, A119632, A160356, A160357, A171175, A171178, A210606, A210607, A210608, A210610-A210613. %K A210609 nonn,hard,more %O A210609 1,8 %A A210609 _Omar E. Pol_, Mar 25 2012