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 A134960 #13 Jul 06 2025 15:02:24 %S A134960 0,453060,906120,1359180,1812240,2265300,2718360,3171420,3624480, %T A134960 4077540,4530600,4983660,5436720,5889780,6342840,6795900,7248960, %U A134960 7702020,8155080,8608140,9061200,9514260,9967320,10420380,10873440,11326500,11779560,12232620,12685680,13138740 %N A134960 a(n) = n*453060. %C A134960 The first positive member of this sequence and some of its multiples are related to the exceptional Lie group E_8 calculation. The result of the calculation is a matrix with 453060 rows and columns. The size of the matrix is a(1)=453060 and the number of entries of the matrix is a(453060)=453060*453060=205263363600. %H A134960 The American Institute of Mathematics, <a href="http://aimath.org/E8">Mathematicians Maps E_8</a>. %H A134960 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1). %F A134960 From _Elmo R. Oliveira_, Jul 05 2025: (Start) %F A134960 G.f.: 453060*x/(1-x)^2. %F A134960 E.g.f.: 453060*x*exp(x). %F A134960 a(n) = 540*A135639(n). %F A134960 a(n) = 2*a(n-1) - a(n-2). (End) %e A134960 a(1) = 453060. a(453060) = 453060*453060 = 205263363600. %t A134960 453060 Range[0,30] (* _Harvey P. Dale_, Oct 11 2023 *) %o A134960 (PARI) concat(0, Vec(453060*x/(x-1)^2 + O(x^30))) \\ _Elmo R. Oliveira_, Jul 05 2025 %Y A134960 Cf. A064730, A134888, A134950, A135639. %K A134960 easy,nonn %O A134960 0,2 %A A134960 _Omar E. Pol_, Nov 27 2007 %E A134960 More terms from _Elmo R. Oliveira_, Jul 05 2025