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 A256873 #18 Sep 08 2022 08:46:12
%S A256873 3,7,18,52,168,592,2208,8512,33408,132352,526848,2102272,8398848,
%T A256873 33574912,134258688,536952832,2147647488,8590262272,34360393728,
%U A256873 137440264192,549758435328,2199028498432,8796103507968,35184393060352,140737530298368,562950037307392
%N A256873 a(n) = 2^(n-1)*(2^n+5).
%C A256873 For k in A059242, a(k) is in A141548, i.e., A256873 o A059242 is a subsequence of A141548.
%H A256873 Colin Barker, <a href="/A256873/b256873.txt">Table of n, a(n) for n = 0..1000</a>
%H A256873 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (6,-8).
%F A256873 G.f.: (3-11*x)/((1-4*x)*(1-2*x)). - _Vincenzo Librandi_, Apr 24 2015
%F A256873 a(n) = 6*a(n-1)-8*a(n-2). - _Colin Barker_, Apr 26 2015
%t A256873 Table[2^(n - 1) (2^n + 5), {n, 0, 30}] (* _Vincenzo Librandi_, Apr 24 2015 *)
%t A256873 LinearRecurrence[{6,-8},{3,7},30] (* _Harvey P. Dale_, Aug 21 2020 *)
%o A256873 (PARI) A256873(n)=2^(n-1)*(2^n+5)
%o A256873 (Magma) [2^(n-1)*(2^n+5): n in [0..30]]; // _Vincenzo Librandi_, Apr 24 2015
%o A256873 (PARI) Vec((3-11*x)/((1-4*x)*(1-2*x)) + O(x^100)) \\ _Colin Barker_, Apr 26 2015
%K A256873 nonn,easy
%O A256873 0,1
%A A256873 _M. F. Hasler_, Apr 24 2015