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 A054606 #19 Jul 11 2021 04:43:34
%S A054606 0,7,140,2205,16408,78155,279972,823585,2097200,4783023,10000060,
%T A054606 19487237,35831880,62748595,105413588,170859465,268435552,410338775,
%U A054606 612220140,893871853,1280000120,1801088667,2494358020,3404825585
%N A054606 a(n) = Sum_{d|7} phi(d)*n^(7/d).
%H A054606 Seiichi Manyama, <a href="/A054606/b054606.txt">Table of n, a(n) for n = 0..10000</a>
%H A054606 <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 A054606 a(n) = n^7 + 6n.
%F A054606 G.f.: 7*x*(x^6+12*x^5+183*x^4+328*x^3+183*x^2+12*x+1) / (x-1)^8. [_Colin Barker_, Dec 21 2012]
%Y A054606 Row n=7 of A185651.
%K A054606 nonn,easy
%O A054606 0,2
%A A054606 _N. J. A. Sloane_, Apr 16 2000