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 A001242 M5433 N2362 #21 Jun 13 2015 00:48:03 %S A001242 1,274,48076,6998824,929081776,117550462624,14500866102976, %T A001242 1765130436471424,213373597575314176,25700650466807540224, %U A001242 3089923562153380965376,371145495540181143169024,44558899569395347436056576,5348360831598738338465357824 %N A001242 Differences of reciprocals of unity. %D A001242 F. N. David, M. G. Kendall and D. E. Barton, Symmetric Function and Allied Tables, Cambridge, 1966, p. 228. %D A001242 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %D A001242 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A001242 Colin Barker, <a href="/A001242/b001242.txt">Table of n, a(n) for n = 1..481</a> %H A001242 Mircea Merca, <a href="http://dx.doi.org/10.1007/s10998-014-0034-3">Some experiments with complete and elementary symmetric functions</a>, Periodica Mathematica Hungarica, 69 (2014), 182-189. %H A001242 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (274,-27000,1224000,-25920000,207360000). %F A001242 G.f.: x / ((1-24*x)*(1-30*x)*(1-40*x)*(1-60*x)*(1-120*x)). %F A001242 a(n) = (1/24) (24^n - 4*30^n + 6*40^n - 4*60^n + 120^n). %o A001242 (PARI) Vec(1/(-207360000*x^5+25920000*x^4-1224000*x^3+27000*x^2-274*x+1) + O(x^100)) \\ _Colin Barker_, Apr 26 2015 %Y A001242 Equals 2^(n-1) * A103878(n). %Y A001242 Right-hand column 4 in triangle A008969. %Y A001242 Cf. a(n) = A112492(n+3, 5). %K A001242 nonn,easy %O A001242 1,2 %A A001242 _N. J. A. Sloane_ %E A001242 Formulae and more terms from _Ralf Stephan_, Feb 20 2005