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 A118439 #11 Oct 18 2024 08:29:26
%S A118439 1,-1,5,11,-23,-41,45,-29,337,1199,-3115,-6469,10297,8839,16125,
%T A118439 108691,-354143,-873121,1721765,2521451,-1476983,6699319,-34182195,
%U A118439 -103232189,242017777,451910159,-597551755,-130656229,-2465133863,-10513816601,29729597085,66349305331,-116749235903
%N A118439 Column 0 of triangle A118438.
%H A118439 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (0, -5, 0, -19, 0, 25).
%F A118439 G.f.: (1-x+10*x^2+6*x^3+21*x^4-5*x^5)/(1-x^2)/(1+6*x^2+25*x^4).
%t A118439 LinearRecurrence[{0, -5, 0, -19, 0, 25}, {1, -1, 5, 11, -23, -41}, 33] (* _Jean-François Alcover_, Apr 08 2024 *)
%o A118439 (PARI) {a(n)=polcoeff((1-x+10*x^2+6*x^3+21*x^4-5*x^5)/(1-x^2)/(1+6*x^2+25*x^4+x*O(x^n)),n)}
%Y A118439 Cf. A118438 (triangle), A118440 (row sums); A118436 (column 0 of inverse).
%K A118439 sign
%O A118439 0,3
%A A118439 _Paul D. Hanna_, Apr 28 2006