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 A055831 #20 Sep 08 2022 08:45:01
%S A055831 5,15,31,54,85,125,175,236,309,395,495,610,741,889,1055,1240,1445,
%T A055831 1671,1919,2190,2485,2805,3151,3524,3925,4355,4815,5306,5829,6385,
%U A055831 6975,7600,8261,8959,9695,10470,11285,12141,13039
%N A055831 T(n,n-4), where T is the array in A055830.
%H A055831 G. C. Greubel, <a href="/A055831/b055831.txt">Table of n, a(n) for n = 4..1000</a>
%H A055831 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (4,-6,4,-1).
%F A055831 a(n) = (n-3)*(n^2+6*n-10)/6, n>3.
%F A055831 G.f.: x^4*(5-5*x+x^2)/(1-x)^4. - _R. J. Mathar_, Mar 13 2016
%F A055831 E.g.f.: (-30 - 6*x + 3*x^2 + (30 - 24*x + 6*x^2 + x^3)*exp(x))/6. - _G. C. Greubel_, Jan 21 2020
%p A055831 seq( (n-3)*(n^2+6*n-10)/6, n=4..40); # _G. C. Greubel_, Jan 21 2020
%t A055831 Table[(n-3)*(n^2+6*n-10)/6, {n,4,40}] (* _G. C. Greubel_, Jan 21 2020 *)
%o A055831 (PARI) a(n) = (n-3)*(n^2+6*n-10)/6; \\ _G. C. Greubel_, Jan 21 2020
%o A055831 (Magma) [(n-3)*(n^2+6*n-10)/6: n in [4..40]]; // _G. C. Greubel_, Jan 21 2020
%o A055831 (Sage) [(n-3)*(n^2+6*n-10)/6 for n in (4..40)] # _G. C. Greubel_, Jan 21 2020
%o A055831 (GAP) List([4..40], n-> (n-3)*(n^2+6*n-10)/6); # _G. C. Greubel_, Jan 21 2020
%Y A055831 Cf. A055830.
%K A055831 nonn,easy
%O A055831 4,1
%A A055831 _Clark Kimberling_, May 28 2000