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 A016771 #14 Sep 08 2022 08:44:41 %S A016771 0,2187,279936,4782969,35831808,170859375,612220032,1801088541, %T A016771 4586471424,10460353203,21870000000,42618442977,78364164096, %U A016771 137231006679,230539333248,373669453125,587068342272,897410677851 %N A016771 a(n) = (3*n)^7. %H A016771 Vincenzo Librandi, <a href="/A016771/b016771.txt">Table of n, a(n) for n = 0..1000</a> %H A016771 <a href="/index/Rec#order_08">Index entries for linear recurrences with constant coefficients</a>, signature (8, -28, 56, -70, 56, -28, 8, -1). %o A016771 (Magma) [(3*n)^7: n in [0..25]]; // _Vincenzo Librandi_, May 09 2011 %Y A016771 Cf. A001015 (n^7). %K A016771 nonn,easy %O A016771 0,2 %A A016771 _N. J. A. Sloane_