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 A128499 #16 Aug 26 2023 19:19:28
%S A128499 1,1,-4,-4,11,11,-24,-24,46,46,-80,-80,130,130,-200,-200,295,295,-420,
%T A128499 -420,581,581,-784,-784,1036,1036,-1344,-1344,1716,1716,-2160,-2160,
%U A128499 2685,2685,-3300,-3300,4015,4015,-4840,-4840,5786,5786,-6864,-6864,8086,8086,-9464,-9464,11011,11011,-12740
%N A128499 Fifth column (m=4) of triangle A128494.
%C A128499 Unsigned, this is the repeated sequence A001752.
%H A128499 Colin Barker, <a href="/A128499/b128499.txt">Table of n, a(n) for n = 0..1000</a>
%H A128499 <a href="/index/Rec#order_11">Index entries for linear recurrences with constant coefficients</a>, signature (1,-5,5,-10,10,-10,10,-5,5,-1,1).
%F A128499 G.f.: -1 / ((x-1)*(x^2+1)^5). - Corrected by _Colin Barker_, Mar 14 2015
%F A128499 a(2*k) = a(2*k+1) = ((-1)^k)*A001752(n), k>=0.
%F A128499 a(n) = ((2*n^4+44*n^3+334*n^2+1012*n+993)*(-1)^((2*n-1+(-1)^n)/4)+(4*n^3+66*n^2+332*n+495)*(-1)^((6*n-1+(-1)^n)/4)+48)/1536. - _Luce ETIENNE_, Mar 14 2015
%t A128499 LinearRecurrence[{1,-5,5,-10,10,-10,10,-5,5,-1,1},{1,1,-4,-4,11,11,-24,-24,46,46,-80},60] (* _Harvey P. Dale_, Aug 26 2023 *)
%o A128499 (PARI) Vec(-1/((x-1)*(x^2+1)^5) + O(x^100)) \\ _Colin Barker_, Mar 14 2015
%Y A128499 Cf. A128498 (column m=3).
%K A128499 sign,easy
%O A128499 0,3
%A A128499 _Wolfdieter Lang_, Apr 04 2007