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 A152224 #11 Jan 03 2024 08:45:48
%S A152224 1,6,30,156,804,4152,21432,110640,571152,2948448,15220704,78573504,
%T A152224 405618240,2093913984,10809365376,55800945408,288059973888,
%U A152224 1487045568000,7676542115328,39628441869312,204573020169216,1056062731892736,5451689048586240,28143132585701376
%N A152224 a(n)=4*a(n-1)+6*a(n-2), n>1 ; a(0)=1, a(1)=6 .
%C A152224 Unsigned version of A152223 .
%H A152224 Harvey P. Dale, <a href="/A152224/b152224.txt">Table of n, a(n) for n = 0..1000</a>
%H A152224 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (4,6).
%F A152224 G.F.: (1+2x)/(1-4x-6x^2).
%t A152224 LinearRecurrence[{4,6},{1,6},30] (* _Harvey P. Dale_, Feb 16 2016 *)
%Y A152224 Cf. A152223
%K A152224 nonn
%O A152224 0,2
%A A152224 _Philippe Deléham_, Nov 29 2008
%E A152224 Corrected and extended by _Harvey P. Dale_, Feb 16 2016