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 A185292 #16 Jun 02 2025 03:54:33
%S A185292 0,0,0,0,1,4,6,8,17,24,26,44,60,60,90,120,115,160,210,196,259,336,308,
%T A185292 392,504,456,564,720,645,780,990,880,1045,1320,1166,1364,1716,1508,
%U A185292 1742,2184,1911,2184,2730,2380,2695
%N A185292 Expansion of (x*(1+x)/(1-x^3))^4.
%C A185292 Expansion of ((x+x^2)/(1-x^3))^k for k = 4 ; for k=1 see A011655, for k = 2 see A186731, for k = 3 see A185395.
%C A185292 Column k = 4 of triangle in A198295.
%H A185292 G. C. Greubel, <a href="/A185292/b185292.txt">Table of n, a(n) for n = 0..1000</a>
%F A185292 G.f.: (x*(1+x)/(1-x^3))^4.
%t A185292 CoefficientList[Series[(x*(1 + x)/(1 - x^3))^4, {x, 0, 50}], x] (* _G. C. Greubel_, Jun 25 2017 *)
%o A185292 (PARI) x='x+O('x^50); concat([0,0,0,0], Vec((x*(1+x)/(1-x^3))^4)) \\ _G. C. Greubel_, Jun 25 2017
%Y A185292 Cf. A011655, A186731, A185395, A198295
%K A185292 easy,nonn
%O A185292 0,6
%A A185292 _Philippe Deléham_, Jan 25 2012