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 A162449 #4 Jul 22 2025 06:55:36 %S A162449 18,2700,992250,250047000,68075295750,253103949598500, %T A162449 24677635085853750,40753351656067050000,1969563638017107451068750, %U A162449 2619519638562752909921437500,2910024366479362207631724918750 %N A162449 Denominators of the column sums of the LG1 matrix. %C A162449 For the definition of the LG1 matrix coefficients see A162448. %C A162449 We define the columns sums by cs(n) = sum(LG1[2*m,n], m = 0.. infinity) for n => 2. %F A162449 a(n) = denom(cs(n)) and numer(cs(n)) = A162448(n). %Y A162449 See A162448 for the numerators of the column sums. %K A162449 easy,frac,nonn %O A162449 2,1 %A A162449 _Johannes W. Meijer_, Jul 06 2009