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 A026542 #16 Apr 10 2022 02:23:20
%S A026542 1,26,443,6292,81081,986622,11585911,132996344,1504338341,16852487938,
%T A026542 187601429379,2079728352156,22993065448081,253755685986374,
%U A026542 2797253854490447,30812086837337728,339233247941143101,3733693166454672330,41085669244650954715
%N A026542 Expansion of 1/((1-2*x)*(1-6*x)*(1-7*x)*(1-11*x)).
%H A026542 G. C. Greubel, <a href="/A026542/b026542.txt">Table of n, a(n) for n = 0..950</a>
%H A026542 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (26,-233,832,-924).
%F A026542 a(n) = (1/180)*(11^(n+3) -9*7^(n+3) +9*6^(n+3) -2^(n+3)). - _R. J. Mathar_, Jun 23 2013
%F A026542 E.g.f.: (1/180)*(-8*exp(2*x) + 1944*exp(6*x) - 3087*exp(7*x) + 1331*exp(11*x)). - _G. C. Greubel_, Apr 09 2022
%t A026542 CoefficientList[Series[1/((1-2x)(1-6x)(1-7x)(1-11x)),{x,0,30}],x] (* _Harvey P. Dale_, May 27 2019 *)
%o A026542 (Magma) [(1/180)*(11^(n+3) -9*7^(n+3) +9*6^(n+3) -2^(n+3)): n in [0..30]]; // _G. C. Greubel_, Apr 09 2022
%o A026542 (SageMath) [(1/180)*(11^(n+3) -9*7^(n+3) +9*6^(n+3) -2^(n+3)) for n in (0..30)] # _G. C. Greubel_, Apr 09 2022
%Y A026542 Cf. A000079, A016129, A016304, A026543.
%K A026542 nonn
%O A026542 0,2
%A A026542 _N. J. A. Sloane_