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 A098878 #21 Mar 13 2024 10:49:14
%S A098878 -2,-1,25,341,3373,29789,250045,2048381,16581373,133432829,1070599165,
%T A098878 8577357821,68669157373,549554511869,4397241253885,35181150961661,
%U A098878 281462092005373,2251748274470909,18014192351838205
%N A098878 a(n) = (2^n - 1)^3 - 2.
%H A098878 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (15,-70,120,-64).
%F A098878 G.f.: (136*x^3-100*x^2+29*x-2) / ((x-1)*(2*x-1)*(4*x-1)*(8*x-1)). - _Colin Barker_, Apr 30 2013
%e A098878 a(2) = (2^2 - 1)^3 - 2 = 25.
%t A098878 Table[(2^n - 1)^3 - 2, {n, 0, 20}] (* _Stefan Steinerberger_, Feb 15 2006 *)
%t A098878 (2^Range[0,20]-1)^3-2 (* or *) LinearRecurrence[{15,-70,120,-64},{-2,-1,25,341},30] (* _Harvey P. Dale_, Jan 29 2016 *)
%o A098878 (PARI) a(n) = (2^n - 1)^3 - 2; \\ _Joerg Arndt_, Apr 30 2013
%Y A098878 See A091515.
%K A098878 sign,easy
%O A098878 0,1
%A A098878 _Parthasarathy Nambi_, Oct 13 2004
%E A098878 More terms from _Stefan Steinerberger_, Feb 15 2006