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 A017239 #18 Sep 08 2022 08:44:42
%S A017239 279936,170859375,4586471424,42618442977,230539333248,897410677851,
%T A017239 2799360000000,7446353252589,17565568854912,37725479487783,
%U A017239 75144747810816,140710042265625,250226879128704,425927596977747
%N A017239 a(n) = (9*n + 6)^7.
%H A017239 Vincenzo Librandi, <a href="/A017239/b017239.txt">Table of n, a(n) for n = 0..10000</a>
%H A017239 <a href="/index/Rec#order_08">Index entries for linear recurrences with constant coefficients</a>, signature (8, -28, 56, -70, 56, -28, 8, -1).
%F A017239 a(n) = 8*a(n-1) - 28*a(n-2) + 56*a(n-3) - 70*a(n-4) + 56*a(n-5) - 28*a(n-6) + 8*a(n-7) - a(n-8); a(0)=279936, a(1)=170859375, a(2)=4586471424, a(3)=42618442977, a(4)=230539333248, a(5)=897410677851, a(6)=2799360000000, a(7)=7446353252589. - _Harvey P. Dale_, Feb 11 2015
%t A017239 (9*Range[0,20]+6)^7 (* or *) LinearRecurrence[{8,-28,56,-70,56,-28,8,-1},{279936,170859375,4586471424,42618442977,230539333248,897410677851,2799360000000,7446353252589},20] (* _Harvey P. Dale_, Feb 11 2015 *)
%o A017239 (Magma) [(9*n+6)^7: n in [0..25]]; // _Vincenzo Librandi_, Jul 25 2011
%Y A017239 Cf. A001015 (n^7), A017233 (9*n+6).
%K A017239 nonn,easy
%O A017239 0,1
%A A017239 _N. J. A. Sloane_