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 A195819 #19 Apr 02 2024 21:45:59 %S A195819 0,29,58,87,116,145,174,203,232,261,290,319,348,377,406,435,464,493, %T A195819 522,551,580,609,638,667,696,725,754,783,812,841,870,899,928,957,986, %U A195819 1015,1044,1073,1102,1131,1160,1189,1218,1247,1276,1305,1334 %N A195819 Multiples of 29. %C A195819 Length of hypotenuses on the main diagonal of the Pythagorean spiral whose edges have length A195033 and whose vertices are the numbers A195034, if n >= 1. %H A195819 Luis Manuel Rivera, <a href="http://arxiv.org/abs/1406.3081">Integer sequences and k-commuting permutations</a>, arXiv preprint arXiv:1406.3081 [math.CO], 2014-2015. %H A195819 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1). %F A195819 a(n) = 29*n. %F A195819 From _Elmo R. Oliveira_, Mar 21 2024: (Start) %F A195819 G.f.: 29*x/(x-1)^2. %F A195819 E.g.f.: 29*x*exp(x). %F A195819 a(n) = 2*a(n-1) - a(n-2) for n >= 2. (End) %t A195819 29Range[0,50] (* _Harvey P. Dale_, Oct 25 2011 *) %Y A195819 Cf. A004922, A004942, A008605, A010868, A135631, A195033, A195034. %K A195819 nonn,easy %O A195819 0,2 %A A195819 _Omar E. Pol_, Oct 12 2011