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 A002609 M5088 N2203 #25 Oct 17 2023 07:17:57 %S A002609 1,-20,-80,144,610,-448,-1120,2240,-3423,-12200,14800,29440,-5470, %T A002609 -6272,-48800,-81664,73090,68460,15600,87840,-139776,82880,189920, %U A002609 -474112,-18525,109400,-251040,412160,-128222,-273280,54400,1059840,1847040 %N A002609 Glaisher's function G(n) (18 squares version). %C A002609 It would be nice to have a q-series that generates this sequence. Glaisher gives many formulas but they are difficult to follow. %D A002609 J. W. L. Glaisher, On the representation of a number as sum of 18 squares, Quart. J. Math. 38 (1907), 289-351 (see p. 311). [The whole 1907 volume of The Quarterly Journal of Pure and Applied Mathematics, volume 38, is freely available from Google Books] %D A002609 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %D A002609 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A002609 Sean A. Irvine, <a href="/A002609/b002609.txt">Table of n, a(n) for n = 1..500</a> %H A002609 <a href="/index/Ge#Glaisher">Index entries for sequences mentioned by Glaisher</a> %F A002609 a(n) = A002611(2*n) - 16*A002611(n). - _Sean A. Irvine_, Mar 04 2019 %Y A002609 Different from A002111 (another Glaisher G(n)). %K A002609 sign %O A002609 1,2 %A A002609 _N. J. A. Sloane_ %E A002609 Edited and signs added by _N. J. A. Sloane_, Nov 26 2018 %E A002609 More terms from _Sean A. Irvine_, Mar 04 2019