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 A210605 #52 Apr 11 2014 00:13:51 %S A210605 1,6,7,20,21,22,23,24,25,62,63,18,17,16,15,14,79,78,77,78,79,80,81,82, %T A210605 83,84,85,86,87,88,89,90,91,224,225,226,227,228,75,74,73,72,71,70,69, %U A210605 68,67,66,65,64,265,264,263,262,261,40,265,494,495,258,259 %N A210605 Bisection of Recamán's sequence A005132. %C A210605 Also length of the vertical edges of a rectangular polyspiral path. For the horizontal edges see A210604. The mentioned polyspiral path is one of the three views of a rectangular polyhelix which is a three-dimensional graphical representation of Recamán's sequence A005132. %H A210605 <a href="/index/Rea#Recaman">Index entries for sequences related to Recamán's sequence</a> %e A210605 1) Written as an irregular array in which each row lists consecutive numbers in ascending order or in descending order: %e A210605 1; %e A210605 6,7; %e A210605 20,21,22,23,24,25; %e A210605 62,63; %e A210605 18,17,16,15,14; %e A210605 79,78,77; %e A210605 78,79,80,81,82,83,84,85,86,87,88,89,90,91; %e A210605 ... %e A210605 2) Written as an irregular array in which each row lists consecutive numbers in ascending order, in descending order or in descending-ascending order: %e A210605 1; %e A210605 6,7; %e A210605 20,21,22,23,24,25; %e A210605 62,63; %e A210605 18,17,16,15,14; %e A210605 79,78,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91; %e A210605 ... %Y A210605 Cf. A005132, A065056, A171175, A171178, A210604-A210607. %K A210605 nonn,tabf %O A210605 1,2 %A A210605 _Omar E. Pol_, Mar 23 2012