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 A016987 #17 Sep 08 2022 08:44:41
%S A016987 0,823543,105413504,1801088541,13492928512,64339296875,230539333248,
%T A016987 678223072849,1727094849536,3938980639167,8235430000000,
%U A016987 16048523266853,29509034655744,51676101935731
%N A016987 a(n) = (7*n)^7.
%C A016987 a(n) = A155955(n,7) for n > 6. - _Reinhard Zumkeller_, Jan 31 2009
%H A016987 Vincenzo Librandi, <a href="/A016987/b016987.txt">Table of n, a(n) for n = 0..1000</a>
%H A016987 <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 A016987 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)=0, a(1)=823543, a(2)=105413504, a(3)=1801088541, a(4)=13492928512, a(5)=64339296875, a(6)=230539333248, a(7)=678223072849. - _Harvey P. Dale_, Apr 01 2013
%t A016987 (7*Range[0,20])^7 (* or *) LinearRecurrence[{8,-28,56,-70,56,-28,8,-1},{0,823543,105413504,1801088541,13492928512,64339296875,230539333248,678223072849},20] (* _Harvey P. Dale_, Apr 01 2013 *)
%o A016987 (Magma) [(7*n)^7: n in [0..25]]; // _Vincenzo Librandi_, Jun 18 2011
%K A016987 nonn,easy
%O A016987 0,2
%A A016987 _N. J. A. Sloane_