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 A051045 #28 Feb 16 2025 08:32:41 %S A051045 1,2,8,44,298,2350,22774,252079,3154451 %N A051045 Number of distinct resistances possible for n resistors with resistances 1, 2, ..., n, each connected in series or parallel to the previous one. %C A051045 For n = 4, there would be an additional 4 possible values if circuits were allowed that combine complex subcircuits in series or parallel, rather than requiring that one of them consists of a single resistor. See illustration in links. - _Kival Ngaokrajang_, Aug 22 2013 (rephrased by _Dave R.M. Langers_, Nov 13 2013) %H A051045 Sean A. Irvine, <a href="https://github.com/archmageirvine/joeis/blob/master/src/irvine/oeis/a051/A051045.java">Java program</a> (github) %H A051045 Kival Ngaokrajang, <a href="/A051045/a051045.pdf">Illustration for n = 4</a> %H A051045 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ResistorNetwork.html">Resistor Network.</a> %H A051045 <a href="/index/Res#resistances">Index to sequences related to resistances</a>. %Y A051045 Cf. A005840. %K A051045 nonn,more %O A051045 1,2 %A A051045 _Eric W. Weisstein_ %E A051045 Offset corrected and a(8)-a(9) from _Sean A. Irvine_, Aug 23 2021