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 A075419 #16 Jul 15 2022 06:35:19
%S A075419 3,-1,-4,6,-1,-7,12,-8,-9,31,-32,-10,75,-95,8,160,-261,111,308,-682,
%T A075419 487,505,-1676,1656,527,-3857,4984,-602,-8237,13825,-6192,-15872,
%U A075419 35891,-26209,-25556,87654,-88305,-24903,200860,-264264,38503,426623,-729392,341270,814747,-1885407,1411928,1288224
%N A075419 Convolution of A073145 with A056594.
%H A075419 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (-1,-2,0,-1,1).
%F A075419 a(n) = -a(n-1) - 2*a(n-2) - a(n-4) + a(n-5); a(0)=3, a(1)=-1, a(2)=-4, a(3)=6, a(4)=-1.
%F A075419 G.f.: (3 + 2*x + x^2)/(1 + x + 2*x^2 + x^4 - x^5).
%t A075419 CoefficientList[Series[(3 + 2x + x^2)/(1 + x + 2x^2 + x^4 - x^5), {x, 0, 50}], x]
%t A075419 LinearRecurrence[{-1,-2,0,-1,1},{3,-1,-4,6,-1},50] (* _Harvey P. Dale_, Jul 27 2019 *)
%Y A075419 Cf. A073145, A075495.
%K A075419 easy,sign
%O A075419 0,1
%A A075419 Mario Catalani (mario.catalani(AT)unito.it), Sep 17 2002