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 A055811 #13 Oct 21 2022 21:37:19
%S A055811 1,63,192,432,832,1452,2364,3653,5418,7773,10848,14790,19764,25954,
%T A055811 33564,42819,53966,67275,83040,101580,123240,148392,177436,210801,
%U A055811 248946,292361,341568,397122,459612,529662
%N A055811 a(n) = T(n,n-6), array T as in A055807.
%H A055811 G. C. Greubel, <a href="/A055811/b055811.txt">Table of n, a(n) for n = 6..1000</a>
%H A055811 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (6,-15,20,-15,6,-1).
%F A055811 From _G. C. Greubel_, Jan 23 2020: (Start)
%F A055811 a(n) = n*(1584 - 310*n - 85*n^2 + 10*n^3 + n^4)/120 for n > 6, with a(6) = 1.
%F A055811 G.f.: x^6*(1 + 57*x - 171*x^2 + 205*x^3 - 125*x^4 + 39*x^5 - 5*x^6)/(1-x)^6.
%F A055811 E.g.f.: (-1)*x*(7200 +4320*x +720*x^2 -120*x^3 -54*x^4 +5*x^5 - (7200 -2880*x + 120*x^3 + 6*x^4)*exp(x))/720. (End)
%p A055811 seq( `if`(n=6, 1, n*(1584 -310*n -85*n^2 +10*n^3 +n^4)/120), n=6..30); # _G. C. Greubel_, Jan 23 2020
%t A055811 Table[If[n==6,1, n*(1584 -310*n -85*n^2 +10*n^3 +n^4)/120], {n,6,30}] (* _G. C. Greubel_, Jan 23 2020 *)
%o A055811 (PARI) vector(25, n, my(m=n+5); if(m==6,1, m*(1584 -310*m -85*m^2 +10*m^3 +m^4)/120) ) \\ _G. C. Greubel_, Jan 23 2020
%o A055811 (Magma) [1] cat [n*(1584 -310*n -85*n^2 +10*n^3 +n^4)/120: n in [7.30]]; // _G. C. Greubel_, Jan 23 2020
%o A055811 (Sage) [1]+[n*(1584 -310*n -85*n^2 +10*n^3 +n^4)/120 for n in (7..30)] # _G. C. Greubel_, Jan 23 2020
%o A055811 (GAP) Concatenation([1], List([7..30], n-> n*(1584 -310*n -85*n^2 +10*n^3 +n^4)/120 )); # _G. C. Greubel_, Jan 23 2020
%Y A055811 Cf. A055807, A055809, A055810, A055815, A055816, A055817.
%K A055811 nonn,easy
%O A055811 6,2
%A A055811 _Clark Kimberling_, May 28 2000